For AI agents: visit https://developer.spreedly.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.
Fraud detection and 3D Secure (3DS) authentication — runs inside Composer checkpoints. A fraud provider and a 3DS challenge each run as a step in the same checkpoint that processes the payment, so risk decisioning and transaction execution happen in one flow.
