For AI agents: visit https://docs.payabl.com/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI. Append .md to any documentation page URL to get its markdown version.
Cards can be declined for various reasons. Whenever a card is declined, a 2-character reason or ‘response’ code is printed on the merchant receipt. Below is a reference list of the most common codes and their meanings.
