{"uid":"cap_J_OfyjoLrudm0yxdJK_uB","slug":"stablemerch-ucp-checkout-session-complete-a5ee9459","name":"StableMerch UCP Checkout Session Complete","description":"Pay for a StableMerch UCP checkout session and send its prepared Printify order to production. Requires checkout status ready_for_complete.","url":"https://stable-merch-git-rfs-checkout-nites-merit-systems.vercel.app/api/ucp/checkout-sessions/stablemerch%3Acheckout%3Acmqiqvn3u0000l504km3kohjm/complete?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"id":{"type":"string","minLength":1,"description":"UCP checkout session ID being completed. AgentCash clients may instead send checkout_session_id."},"payment":{},"checkout_session_id":{"type":"string","minLength":1,"description":"AgentCash checkout session ID being completed. UCP clients may instead send id."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"50","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$50/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"50","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"50","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_y3KIr4IBFIhplxmJgAL-q","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"50","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Pays for a StableMerch UCP checkout session and submits its prepared Printify order to production fulfillment.","exampleAgentPrompt":"Complete my StableMerch checkout session cmqiqvn3u0000l504km3kohjm — it's ready for completion, so go ahead and pay the $50 USDC and send the Printify order to production.","exampleUseCases":[{"title":"Finalize custom merch drop order","prompt":"My StableMerch checkout session for the hoodie order is ready to go — please pay the $50 USDC and push it to Printify production so it starts fulfillment."},{"title":"Automated agent merch order completion","prompt":"After the customer approved the design, the checkout session cmqiqvn3u0000l504km3kohjm is now ready_for_complete — go ahead and complete it by paying and sending the order to production."},{"title":"On-demand print order submission","prompt":"I've got a StableMerch UCP checkout session that's been approved and sitting at ready_for_complete status — please finalize it and get the Printify order into production now."}],"resultDescription":"Returns a confirmation that the checkout session payment was processed (50 USDC) and the prepared Printify order has been submitted to production for fulfillment, along with order status details.","failureModes":["Checkout session not in ready_for_complete status — returns an error indicating the session is not eligible for completion","Invalid or expired checkout session ID — returns 404 or session-not-found error","Insufficient USDC funds — payment fails and order is not submitted","Printify order submission failure — payment may succeed but production submission fails","Duplicate completion attempt — idempotency violation since the endpoint is not idempotent"],"whenToPreferThis":"Use this endpoint when you have a StableMerch UCP checkout session that has been fully prepared and is in ready_for_complete status and you need to pay for it and submit the Printify order to production in a single call. This is the final step in the StableMerch UCP checkout flow, not for creating or modifying orders.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T18:32:22.448Z","isFirstParty":false,"canonicalSlug":"stablemerch-ucp-checkout-session-complete-8f925a8d"}