To integrate with Visa Checkout, please follow these integration guides - https://developer.visa.com/capabilities/visa_checkout/docs
Visa Checkout isn't currently running any promotions or facilitating integration assistance for donations.
Remember you'll need to have an active merchant acquiring account to process Visa Checkout transactions.
I am happy to help you resolve any issues that you are experiencing with Visa Checkout. Can you please let us know what is the issue? Are you receiving an error in your code? If so, what is the error?
To further investigate, please provide the following information:
1. End Point
2. Request Header
3. Request Body
4. Response Header (include the x-correlation-id)
5. Response Body
Using SoapUI, you can find the x-correlation-id in the Raw Tab of the response header.