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Technical guide to implementing ACP endpoints and webhooks for ChatGPT Instant Checkout.
Last updated: February 3, 2026
This content is based on official sources and ecosystem developments:
This guide covers implementing the Agentic Commerce Protocol (ACP) so your store supports Instant Checkout in ChatGPT and other ACP-enabled surfaces.
You need to implement endpoints that ACP agents can call:
Exact shapes depend on the current ACP spec; refer to OpenAI's ACP docs and Stripe's ACP guide for the latest.
Build the three endpoint handlers and ensure they accept the request format ACP specifies. Handle errors and return the expected response schema.
Use webhooks where the spec requires them, and implement idempotency keys for create/complete to avoid duplicate orders.
CTA: Run ACP Endpoint Test — validate that your ACP endpoints respond correctly.