Form fields

The final confirmation page on your website must contain:

  • An HTML FORM with the Action set to the Opayo Form submission URL
  • The following four hidden fields as part of that Form:

Hidden Form Fields Description Table

Name

Description

Mandatory

Valid Characters

Max Length

Allowed Values

VPSProtocol

This is the version of the protocol you are integrating with. Default or incorrect value is taken to be 4.00.

Yes

Digits and periods
 

4

4.00

TxType

This value should be in UPPERCASE.

Yes

Uppercase letters

15

  • PAYMENT
  • DEFERRED
  • AUTHENTICATE

Vendor

This field is used to authenticate your site.  It should contain the Opayo Vendor Name supplied by Opayo when your account was created.

Yes

Letters and digits
 

15

 

Crypt

Your site builds the Crypt  field in real time for each order. The contents of the field are described below. All other transaction information is encrypted then encoded.

Yes

DEPENDANT