The EPAS protocol is one method of controlling a payment terminal from an Electronic Cash Register (ECR). The messages sent from the ECR to the payment terminal is sent in XML over a TCP/IP socket.

The interface between the payment application and the ECR provides a range of functionality including:

• ECR login
• Starting a transaction
• Handling message display on the ECR
• Printing receipts on the ECR
• Performing administrative functions

In an EPAS integration all transactions is initiated by the operator of the ECR, performed by the payment terminal and completed by the Customer. Example:

1. The ECR operator sells a product and presses the "pay with card" button.
2. The ECR sends a signal to the payment terminal to perform a payment for X amount.
3. The customer is clearly instructed on the terminal of what to do and all messages on the terminal is reported back from the payment terminal to the ECR.
4. The customer confirms and completes the transaction
5. The payment terminal gives the customers a on-screen result of the transaction and reports back the result to the ECR.
6. The ECR receives the result along with payment info and then prepares and prints a payment receipt.

• Proven protocol used globally
• Compatibility with all Westpay card termianls
• Predecessor to Nexo
• No changes, the EPASOrg spec is considered locked for future changes
  

To get started with an EPAS integration project you should have a Westpay terminal and our EPAS ECR simulator software.  You will also need three pieces of information for the simluator to work:

• The Terminal ID.  This is normally a 8-digit number beginning 800.
• The PPL Server Address.  This is the configuration server, and you will normally use 185.27.171.42:55133.
• The SPDH Server Address.  This is the authorisation server, and you will normally use 185.27.171.42:55144.

Use these three pieces of information in the ECR simulator's login details and you should be able to run transactions easily and quickly.

The nexo retailer protocol is one method of controlling a payment terminal from an Electronic Cash Register (ECR). The messages sent between the ECR and the payment terminal is in XML-format over a TCP/IP socket.

The interface between the payment application and the ECR provides a range of functionality including:

• ECR login
• Starting a transaction
• Handling message display on the ECR
• Printing receipts on the ECR
• Performing administrative functions

In an nexo integration all transactions is initiated by the operator of the ECR, performed by the payment terminal and completed by the Customer. Example:

1. The ECR operator sells a product and presses the "pay with card" button.
2. The ECR sends a signal to the payment terminal to perform a payment for X amount.
3. The customer is clearly instructed on the terminal of what to do and all messages on the terminal is reported back from the payment terminal to the ECR.
4. The customer confirms and completes the transaction
5. The payment terminal gives the customers a on-screen result of the transaction and reports back the result to the ECR.
6. The ECR receives the result along with payment info and then prepares and prints a payment receipt.

• Future proof, new functions added regularly
• ISO20022 standard
• Includes all operations form the predecessor EPAS
• Used by others giving you access to not only Westpay hardware but also competitors