TW201543388A - Sales device and electronic transaction system and method using the same - Google Patents

Abstract

A sales device and an electronic transaction system and a transaction method are disclosed. The system includes a sales device and a client device. The sales device includes a storage unit, a first communication module and a second communication module. Several pieces of product information are stored in the storage unit. The first communication module establishes a security connection with one single client device at a time. The second communication module establishes, after the security connection is established, a data connection with the client device. The product information is transferred from the sales device to the client device through the data connection.

Description

Sales terminal device and electronic trading system and method thereof

The present invention relates to a sales terminal device and an electronic transaction system and method therefor, and more particularly to a sales terminal device for establishing a connection with a client and an electronic transaction system and an electronic transaction method thereof.

Electronic payment has the advantages of convenience of payment and security of payment, and is gradually being valued by users and manufacturers. Since electronic payment does not require the consumer to carry cash change on the body, the problem of zeroing is eliminated; at the same time, for the manufacturer, the sales and the customer's attribute data can be quickly established. Therefore, the proportion of electronic payments has exploded in recent years.

Also because of the fast and immediate electronic payment, there is a certain pressure on the traditional inventory sales system. Generally, after the front end uses the sales endpoint system to perform the checkout payment, it must be connected with the inventory system and update the inventory data. When multiple sales endpoint systems are connected to the inventory system at the same time, and the inventory data is updated, due to factors such as network bandwidth or network stability, it is easy to cause inventory data to be updated immediately, and more serious will result in inventory data. A situation that is inconsistent with the actual sales side.

For example, a vending machine with internet connection needs to be connected to a remote inventory system to update information on the merchandise items sold in the vending machine, such as type, quantity, and the like. When there is a problem with the network, the inventory system cannot immediately connect to the vending machine to obtain instant merchandise information of the vending machine. Especially in the actual situation, there will be thousands of vending machines selling products at the same time. If the central inventory system cannot obtain the product sales information of each vending machine in real time, it will easily lead to incorrect inventory quantity and insufficient stocking, logistics The problem of not getting the goods. On the other hand, when the vending machine replenishes the product, if the product information cannot be updated to the central inventory system, the problem of inconsistency between the actual vending product and the remote inventory system may occur.

Furthermore, there is currently a vending machine on the market that allows users to use their portable electronic devices such as mobile phones and tablets to purchase products. Its trading mechanism uses the portable electronic device to connect with the remote inventory server, and performs the ordering, purchase and checkout actions. If the remote inventory server data and the vending machine data are inconsistent at this time, there will be no dilemma for the vending machine after the checkout is completed. This will lead to management inconvenience in all aspects of inventory, logistics and stocking.

In view of the above, the object of the present invention is to provide a sales terminal device and an electronic transaction system and method using the same, which utilizes a sales terminal device to actively and immediately provide product information to a client device, thereby solving local and remote data inconsistency. Many problems caused.

One aspect of the present invention provides an electronic transaction system including a client device and a sales terminal device. The sales terminal device includes a storage unit, a first communication module and a second communication module. The storage unit stores multiple product information. The first communication module is used to establish a secure connection with the client device. The first communication module establishes a secure connection with only a single client device at the same time. The second communication module is used to suggest a secure connection with the client device Establish a data connection. The sales terminal device transmits the product information to the client device via a data connection.

According to an embodiment of the invention, the communication distance of the second communication module is greater than the communication distance of the first communication module.

According to another embodiment of the present invention, the communication bandwidth of the second communication module is greater than the communication bandwidth of the first communication module.

According to an embodiment of the invention, the client device includes a checkout module for performing checkout based on at least one of the item information. The checkout module generates a transaction voucher.

According to another embodiment of the present invention, the client device includes a checkout module for performing checkout with a billing server based on at least one of the merchandise information. The accounting server generates a transaction voucher.

According to a further embodiment of the invention, the client device transmits the transaction credentials to the sales terminal device via the data connection.

Another aspect of the present invention is directed to a point-of-sale device for conducting electronic transactions. The sales terminal device includes a storage unit, a first communication module and a second communication module. The storage unit stores multiple product information. The first communication module is configured to establish a secure connection with an external device. The first communication module establishes a secure connection with only a single external device at the same time. The second communication module is configured to establish a data connection with the external device after establishing a secure connection. The sales terminal device transmits the product information to the external device via the data connection.

According to an embodiment of the invention, the communication distance of the second communication module is greater than the communication distance of the first communication module.

According to another embodiment of the present invention, the communication bandwidth of the second communication module is greater than The communication bandwidth of a communication module.

According to still another embodiment of the present invention, the sales terminal device receives a transaction voucher from the external device via the data connection.

Yet another aspect of the present invention is to provide an electronic transaction method comprising the following steps. First, a secure connection between a point-of-sale device and a single client device is established. Secondly, after establishing a secure connection, a data connection between the sales terminal device and the client device is established. Furthermore, the sales terminal device transmits a plurality of product information to the client device via the data connection.

According to an embodiment of the invention, the electronic transaction method further comprises the following steps. First, the client device performs checkout based on at least one of the product information. Second, a transaction credential is generated by the client device.

According to another embodiment of the present invention, the electronic transaction method further includes the following steps. First, the client device performs checkout with a billing server based on at least one of the merchandise information. Second, a transaction voucher is generated by the accounting server.

The sales terminal device and the electronic transaction system and method using the same according to the embodiments of the present invention, the first communication module is used by the sales terminal device to establish a unique secure connection with the client device, and the second communication module is used to establish the data. Connect to transfer multiple product information from the sales terminal device to the client device. Therefore, the client device can learn the instant product information, and then perform the action of purchasing the checkout, thereby avoiding the problem caused by the inconsistency of the product information between the sales terminal device and the remote server.

100,200‧‧‧Electronic Trading System

110, 210‧‧‧ sales terminal device

111, 211‧‧‧ first communication module

112, 212‧‧‧ second communication module

113, 213‧‧‧ storage unit

120, 220‧‧‧ client devices

121, 221‧‧‧ third communication module

122, 222‧‧‧ fourth communication module

125, 225‧‧‧Checkout Module

127, 227‧‧‧ operation module

215‧‧‧Server connection module

230‧‧‧Accounting Server

Cer‧‧‧ transaction voucher

P‧‧‧Product Information

L1‧‧‧ secure connection

L2‧‧‧ data connection

S11, S12, S13, S14, S15, S16‧‧‧ method steps

S21, S22, S23, S24, S25, S26‧‧‧ method steps

The above and other objects, features, advantages and embodiments of the present invention will become more apparent. The description of the drawings is as follows: FIG. 1 is a functional block diagram of an electronic transaction system according to an embodiment of the invention; and FIG. 2 is a flow chart of a method for electronic transaction according to an embodiment of the invention. FIG. 3 is a functional block diagram of an electronic transaction system according to another embodiment of the present invention; and FIG. 4 is a flow chart showing a method of an electronic transaction method according to another embodiment of the present invention.

The sales terminal device and the electronic transaction system and the electronic transaction method using the same according to the embodiments of the present invention establish a data connection by establishing a secure connection first, so that a unique and secure connection between the sales terminal device and the client device is established. Connected. The sales terminal device transmits the instant product information to the client device for the consumer to purchase at the client device and complete the checkout purchase action. In this way, the problem of inconsistency between the remote server and the on-site merchandise information due to the network connection problem can be avoided. The embodiments are described in detail below, and the examples are only intended to be illustrative and not intended to limit the scope of the invention. Further, unnecessary elements have been omitted in the drawings of the embodiments to clearly show the technical features of the present invention.

Please refer to FIG. 1 , which is a functional block diagram of an electronic transaction system in accordance with an embodiment of the present invention. The electronic transaction system 100 includes a sales terminal device 110 and a client device 120. The sales terminal device 110 includes a first communication module 111, a second communication module 112, and a storage unit 113. The first communication module 111 is configured to establish a secure connection L1 with the client device 120. It is noted that, in the embodiment, the first communication module 111 establishes a secure connection with only a single client device 120 at the same time. Line L1. After the secure connection L1 is established, the second communication module 112 establishes a data connection L2 with the client device 120. The storage unit 113 stores a plurality of product information P, and the sales end The device 110 transmits the aforementioned commodity information P to the client device 120 via the data connection L2. In this manner, the electronic transaction system 100 of the present embodiment transmits the product information P from the sales terminal device 110 via the data connection line L2 after establishing a unique secure connection L1 between the sales terminal device 110 and the client device 120. To the client device 120. Therefore, the most immediate product information P in the sales terminal device 110 can be transmitted to the client device 120, so that the user can fully grasp the currently available product information.

The sales terminal device 110 will be further described below. The first communication module 111 of the sales terminal device 110 is used to establish a unique secure connection L1 with the client device 120. In practical applications, a short-range wireless communication module, such as a Near Field Communication (NFC) module, can be used to ensure that the first communication module 111 is only connected to a single client device 120 within the same time. However, the present invention is not limited to the near field communication module, as long as it is another communication technology that can be used to establish a unique connection between the two devices, such as Bluetooth, Zigbee or other wireless communication technologies. As used herein, the invention is not limited thereto.

On the other hand, the second communication module 112 is used to transmit data between the sales terminal device 110 and the client device 120. Therefore, in order to transmit data quickly and stably, a wireless communication module with a large bandwidth can be used. For example, a wireless compatibility (Wireless Fidelity, WiFi) communication module. However, the present invention is not limited thereto, and other communication technologies capable of wireless data transmission between the two devices can be used.

In practical applications, the first communication module 111 and the second communication module 112 can use the same or different communication technologies, as long as the first communication module 111 is used to establish the secure connection L1, and the second communication module 112 is used to establish The data link L2 is within the scope of the present invention. In addition, the first communication module 111 can use the communication for cost, power or other practical considerations. Short distance, or communication technology with small communication bandwidth. That is, the communication distance of the second communication module 112 is greater than the communication distance of the first communication module 111. Alternatively, in another embodiment, the communication bandwidth of the second communication module 112 is greater than the communication bandwidth of the first communication module 111. For example, the first communication module 111 uses a near field communication module, and the second communication module 112 uses a Bluetooth communication module; for example, the first communication module 111 uses a Bluetooth communication module, and the second communication module 112 uses a wireless compatible module. Sexually certified communication module. In an embodiment, the first communication module 111 and the second communication module 112 perform an action of establishing a connection by automatically connecting. As long as the sales terminal device 110 detects that the client device 120 is in proximity, the secure connection L1 and the data connection L2 are automatically established. It is the user who does not need to perform any operation. In another embodiment, the user can perform the connection operation at the sales terminal device 110 (for example, pressing the connection confirmation button), and the electronic sales system 100 starts the operation of establishing the secure connection L1 and the data connection L2. .

In addition, the storage unit 113 of the sales terminal device 110 stores a plurality of product information P. In one embodiment, each of the product information examples P includes the name and price of the product. However, the content of the product information P is not limited thereto, and may further include information on the location of the product, the expiration date, and the manufacturer, etc., for the user to identify the product. In addition, the product names in the plurality of product information P may be the product names of different items or the same item, or the product names of the same items. For example, when applied to a beverage vending machine, the vending machine often has a plurality of goods of the same name, so that duplicate product names may also appear in the plurality of product information P. In the embodiment of the present invention, the sales terminal device 110 simultaneously transmits a plurality of pieces of product information P to the client device 120, and it is within the scope of the present invention whether or not each piece of product information P has the same product name, price, and the like.

Next, the client device 120 will be further described. In this embodiment The client device 120 is an external device for the sales device 110. The client device 120 includes a third communication module 121 and a fourth communication module 122. The third communication module 121 uses the same communication technology as the first communication module 111 to establish a secure connection L1 with the first communication module 111. The fourth communication module 122 uses the same communication technology as the second communication module 112 to establish a data connection L2 with the second communication module 112. In another embodiment, when the first communication module 111 of the sales terminal device 110 and the second communication module 112 use the same communication technology, the client device 120 may only include one corresponding communication module, respectively A communication module 111 establishes a secure connection L1 and establishes a data connection L2 with the second communication module 112.

The client device 120 further includes a checkout module 125, as shown in FIG. The checkout module 125 performs checkout based on at least one of the plurality of pieces of product information P received. In the present embodiment, the checkout module 125 uses an electronic wallet of the client device 120 to directly perform an action such as an electronic wallet deduction, a deduction point, and the like in the client device 120 to perform checkout. However, the checkout action of the checkout module 125 is not limited thereto, and the client device 120 may be used to sense or read a credit card or a stored value card for checkout. In addition, in another embodiment, the checkout module 125 performs an action of checking out via a connection to an external server, the contents of which will be detailed later.

On the other hand, the checkout module 125 generates a transaction voucher Cer after the checkout is completed. The transaction voucher Cer may be an invoice, a transaction completion notice, or a transaction detail, or may be any other form of voucher available to the sales terminal device 110 to confirm the completion of the checkout. After the checkout module 125 generates the transaction credential Cer, the client device 120 transmits the transaction credential Cer to the sales terminal device 110. After receiving the transaction voucher Cer, the sales terminal device 110 performs subsequent actions, such as giving the goods by the vending machine, opening the parking lot fence to release the vehicle, and notifying the kitchen to start the meal preparation and the like.

In one embodiment, the transaction credential Cer is transmitted back to the sales end device 110 via the data link L2, but the technology of the present invention is not limited thereto. In different embodiments, the transaction credential Cer may also be transmitted back to the sales end device 110 via the secure connection L1, or first transmitted by the client device 120 to an external server, and the transaction credential Cer may be transmitted to the sales end device via the external server. 110. As long as the transaction voucher Cer is generated by the checkout module 125 of the client device 120 and the sales terminal device 110 receives the transaction voucher Cer, it is within the scope of the present invention.

The client device 120 of the embodiment further includes an operation module 127, such as a touch screen. After the client device 120 receives the foregoing plurality of product information P, the client device 120 directly presents the product information P to the user, or converts the product information to the user after being converted by the internal software. For example, the visual interface and the menu list are presented to the user on the display screen. The user can browse the merchandise via the operation module 127 and select the item to be purchased. That is to say, in the embodiment of the present invention, the transaction mastership of the electronic transaction system 100 lies in the client device 120, and the user does not need to perform any operation of selecting the commodity or the purchase behavior on the sales terminal device 110, only in the client device. Operate, select and purchase merchandise on 120.

The detailed description of the above embodiments is for explaining the sales terminal device and the electronic transaction system. Next, an electronic transaction method according to an embodiment of the present invention will be described with reference to the drawings. Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 2 is a flow chart of a method for an electronic transaction method according to an embodiment of the invention. The electronic transaction method of this embodiment is described by taking the electronic transaction system 100 as an example.

The electronic transaction method of the embodiment of the present invention includes the following steps. First, as shown in step S11, a secure connection L1 between the sales terminal device 110 and the client device 120 is established. After the security connection L1 is established, step S12 is performed to establish a relationship between the sales terminal device 110 and the client device 120. The data is connected to L2. Next, as shown in step S13, the sales terminal device 110 transmits a plurality of pieces of product information P to the client device 120 via the data connection line L2. After the client device 120 receives the product information P, the electronic transaction method of the embodiment proceeds to step S14, and the client device 120 performs checkout based on at least one of the product information P. Next, the transaction credential Cer is generated by the client device 120 as shown in step S15. Next, in step S16, the client device 120 transmits the transaction certificate Cer to the sales terminal device 110 via the data connection L2 to cause the sales terminal device 110 to perform the next operation.

Next, an electronic transaction system in accordance with another embodiment of the present invention will be described.

Please refer to FIG. 3, which is a functional block diagram of an electronic transaction system in accordance with another embodiment of the present invention. The electronic transaction system 200 includes a sales terminal device 210 and a client device 220. The sales terminal device 210 includes a first communication module 211, a second communication module 212, and a storage unit 213. The first communication module 211 is configured to establish a secure connection L1 with the client device 220. In this embodiment, the first communication module 211 establishes a secure connection L1 with only a single client device 220 at the same time. After the secure connection L1 is established, the second communication module 212 establishes a data connection L2 with the client device 220. The storage unit 213 stores a plurality of product information P, and the sales terminal device 210 transmits the aforementioned product information P to the client device 220 via the data connection L2. The contents are the same as those of the foregoing embodiment in conjunction with FIG. 1, and will not be described below.

The difference between this embodiment and the foregoing embodiment lies in the manner of checkout and the manner in which the transaction voucher is generated. The electronic transaction system 200 of the embodiment further includes a billing server 230. The checkout module 225 of the client device 220 is based on at least one of the received plurality of product information P, and according to the user's operation mode. The operation of group 227 is checked out with the accounting server 230. In the present embodiment, the checkout module 225 transmits the checkout information to the account server 230, and the account server 230 performs actions such as deduction, credit card authentication, and deduction points. In this embodiment, after the accounting server 230 completes the checkout action, the transaction voucher Cer is generated by the account server 230, and the transaction voucher Cer is transmitted to the client device 220 (eg, received by the checkout module 225). Trading Document Cer). After receiving the transaction credential Cer, the client device 220 transmits the transaction credential to the sales end device 210 via the data connection L2 (or optionally using the secure connection L1) for subsequent actions.

The foregoing is an example in which the transaction voucher Cer is transmitted back to the client device 220, but the technology of the present invention is not limited thereto. The sales terminal device 210 of this embodiment may further include a server communication module 215 for connecting to the accounting server 230. The account server 230 can also pass the transaction voucher Cer to the sales terminal device 210 (for example, the transaction voucher Cer is received by the server communication module 215), and the sales terminal device 210 can directly perform subsequent actions after receiving the transaction voucher Cer. In another embodiment, the billing server 230 can simultaneously transmit the transaction credential Cer to the sales terminal device 210 and the client device 220. The sales end device 210 can compare the transaction credential Cer received by the server communication module 215 with the transaction credential Cer sent by the client device 220 to the sales end device 210, thereby confirming the authenticity and legality of the transaction credential Cer. Improve the security and correctness of the transaction.

Next, an electronic transaction method according to an embodiment of the present invention will be described with reference to the drawings. Please refer to FIG. 3 and FIG. 4 simultaneously. FIG. 4 is a flow chart showing a method of an electronic transaction method according to another embodiment of the present invention. The electronic transaction method of this embodiment is described by taking the application in the electronic transaction system 200 as an example.

The electronic transaction method of the embodiment of the present invention includes the following steps. First, as step As shown in step S21, a secure connection L1 between the sales terminal device 210 and the client device 220 is established. After the secure connection L1 is established, step S22 is performed to establish a data connection L2 between the sales end device 210 and the client device 220. Next, as shown in step S23, the sales terminal device 210 transmits a plurality of pieces of product information P to the client device 220 via the data link L2. After the client device 220 receives the product information P, the electronic transaction method of the embodiment proceeds to step S24, and the client device 220 performs checkout with the account server 230 based on at least one of the product information P. Next, the transaction voucher Cer is generated by the account server 230 as shown in step S25. In the present embodiment, the accounting server 230 transmits the transaction certificate Cer to the client device 220. Next, the electronic transaction method of the embodiment proceeds to step S26, and the client device 220 transmits the transaction certificate Cer to the sales terminal device 210 via the data connection line L2 to cause the sales terminal device 210 to perform the next operation.

The sales terminal device and the electronic transaction system and method using the same according to embodiments of the present invention can be applied to many sales situations. An electronic transaction system 100 (shown in FIG. 1) in accordance with an embodiment of the present invention is exemplified and can be applied to a vending machine transaction system. The sales end device 110 is a vending machine, and the product information P is information of the instant goods in the vending machine, such as the name, price, remaining quantity of the beverage, and the position of the shelf in the vending machine where the beverage is located. The client device 120 is, for example, a portable electronic device such as a mobile phone or a tablet computer, and the user can directly obtain the product information P in the vending machine on the mobile phone and purchase it. When the vending machine (sales terminal device 110) receives the transaction voucher Cer, the action of giving the object can be performed.

In another sales situation, the electronic transaction system 100 is a ordering system. The sales terminal device 110 is a one-time meal device, which may be a tablet computer held by a waiter or directly integrated in a table of a consumer's seat. The product information P stored by the sales terminal device 110 is, for example, an instant meal price, a meal type, and the like. The client device 120 is, for example, a mobile phone or a tablet computer. The electronic device allows the consumer to obtain the product information P in the ordering device directly on the mobile phone and order the meal. After the ordering device (sales terminal device 110) receives the transaction voucher Cer, an action of notifying the kitchen preparation or service personnel to make a meal may be performed. Another application is in the situation of the restaurant system. After the meal is completed, the consumer obtains the order details and the price information through the connection between the client device 120 and the sales device. After confirming the error, the client device 120 can be directly used. Check out. In such a use situation, the consumer can order the meal according to the usual customary ordering method (for example, the action of ordering and delivering the order by the waiter), that is, the user does not need to perform the ordering action on the client device.

In another sales situation, the electronic trading system 100 is a parking lot management system. The sales terminal device 110 is a vehicle access control device, and may be, for example, a gate device for button ticket collection. The commodity information P stored by the sales terminal device 110 is, for example, information such as the number of instant parking spaces, the parking space location, or the number of parking hours. The client device 120 is, for example, a portable electronic device such as a mobile phone or a tablet computer; or directly integrated in the vehicle, the vehicle is regarded as the client device 120. The driver can obtain the product information P in the vehicle access control device directly on the mobile phone or the vehicle system, thereby performing the operation of renting the parking space. When the vehicle access control device (sales terminal device 110) receives the transaction voucher Cer, the parking lot fence is opened to allow the vehicle to enter the parking lot. On the other hand, when the vehicle wants to leave the parking lot, the driver can obtain the product information P in the vehicle access control device directly on the mobile phone or the vehicle system, thereby performing the checkout action of paying the parking fee. After the vehicle access control device (sales terminal device 110) receives the transaction voucher Cer, the parking lot fence can be opened to allow the vehicle to leave the parking lot.

Embodiments of the present invention disclose a sales terminal device and an electronic transaction system and method thereof for solving product information and a remote server in a local sales terminal device Inconsistent product information. In addition, the user only needs to operate on the client device, and controls the entire transaction behavior, and does not need to perform operations for selecting goods or purchasing behavior on the sales terminal device, thereby improving the convenience of use. In addition, by establishing a unique secure connection and then establishing a data connection, other client devices or other sales-side devices will not intervene in the electronic transaction, which can improve the security of the transaction.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Electronic Trading System

110‧‧‧Sale terminal device

111‧‧‧First Communication Module

112‧‧‧Second communication module

113‧‧‧ storage unit

120‧‧‧Client device

121‧‧‧3rd communication module

122‧‧‧fourth communication module

127‧‧‧Operating module

125‧‧‧Checkout Module

Cer‧‧‧ transaction voucher

L1‧‧‧ secure connection

L2‧‧‧ data connection

P‧‧‧Product Information

Claims (18)

An electronic transaction system comprising: a client device; and a sales terminal device, comprising: a storage unit storing a plurality of commodity information; and a first communication module for establishing a secure connection with the client device The first communication module establishes the secure connection with only one client device at a time; and a second communication module is configured to establish a data with the client device after establishing the secure connection. The connection, wherein the sales terminal device transmits the commodity information to the client device via the data connection. The electronic transaction system of claim 1, wherein the communication distance of the second communication module is greater than the communication distance of the first communication module. The electronic transaction system of claim 1, wherein the communication bandwidth of the second communication module is greater than the communication bandwidth of the first communication module. The electronic transaction system of any one of the preceding claims, wherein the client device comprises: a checkout module, configured to perform checkout according to at least one of the commodity information, the knot The account module generates a transaction voucher. The electronic transaction system of claim 4, wherein the client device transmits the transaction voucher to the sales terminal device via the data connection. The electronic transaction system of any one of claims 1-3, wherein the client device comprises: a checkout module for performing checkout with a billing server based on at least one of the item information, the billing server generating a transaction credential. The electronic transaction system of claim 6, wherein the client device transmits the transaction voucher to the sales terminal device via the data connection. For example, the electronic transaction system described in claim 1 wherein each of the product information includes a product name and a price. A sales-side device for electronically trading, the sales-side device comprising: a storage unit storing a plurality of commodity information; and a first communication module for establishing a secure connection with an external device, wherein the a communication module establishes the secure connection with only one external device at a time; and a second communication module is configured to establish a data connection with the external device after establishing the secure connection, wherein the sales The end device transmits the item information to the external device via the data connection. The sales terminal device of claim 9, wherein the communication distance of the second communication module is greater than the communication distance of the first communication module. The sales terminal device of claim 9, wherein the communication bandwidth of the second communication module is greater than the communication bandwidth of the first communication module. The sales terminal device of claim 9, wherein the sales terminal device receives a transaction voucher from the external device via the data connection. The sales terminal device of claim 9, wherein each of the product information includes a product name and a price. An electronic transaction method comprising: Establishing a secure connection between a sales terminal device and a single client device; after establishing the secure connection, establishing a data connection between the sales terminal device and the client device; and by the sales terminal device The data is connected to transmit a plurality of product information to the client device. The electronic transaction method of claim 14, further comprising: performing, by the client device, the checkout according to at least one of the commodity information; and generating a transaction voucher by the client device. The electronic transaction method of claim 15, further comprising: transmitting, by the client device, the transaction voucher to the sales terminal device via the data connection. The electronic transaction method of claim 14, further comprising: performing, by the client device, a checkout with a billing server according to at least one of the commodity information; and generating by the accounting server A transaction voucher. The electronic transaction method of claim 17, further comprising: transmitting, by the client device, the transaction voucher to the sales terminal device via the data connection.