Integrate PayPal as an ACP payment gateway so your small-merchant store can accept ChatGPT agent-initiated purchases through PayPal's ACP server without building a full ACP checkout API
Connect your store to PayPal's ACP server: PayPal operates as an ACP server intermediary that brings tens of millions of PayPal-connected merchants onto ACP without each merchant building the five ACP REST endpoints individually.
In your PayPal developer account, enable the Agentic Commerce module and verify your product catalog is linked to your PayPal business account so PayPal can serve product data on your behalf to ACP-compatible agents.
For payment processing, PayPal handles Shared Payment Token (SPT) acceptance on your behalf; when a ChatGPT user's agent initiates a purchase, PayPal validates the SPT and charges the buyer's PayPal wallet or linked card.
Configure order notification webhooks in the PayPal developer dashboard to receive PAYMENT.CAPTURE.COMPLETED events when an agent-initiated purchase completes; use these to trigger fulfillment in your existing order management system.
Test the integration using the PayPal sandbox with a test ACP-compatible agent client; verify that order events reach your webhook and that the product, price, and shipping details are passed correctly.
Known gotchas
PayPal's ACP server approach is designed for merchants who do not want to build their own ACP checkout API; if you need custom checkout flows (multi-item carts with complex logic, configurable bundles), you may still need a direct ACP integration.
PayPal processes ACP payments through its wallet and linked card infrastructure; agents using Shared Payment Tokens backed by non-PayPal payment methods may not be supported — verify SPT compatibility with PayPal's ACP server documentation.
The PayPal ACP server integration timeline and exact API surface are evolving; check the PayPal developer portal for the latest onboarding guide, as specifics may differ from the initial 2025 announcement.
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