{"uid":"cap_FOx9kM8gZTPwbEZ4EWvlp","slug":"stablemerch-ucp-checkout-session-complete-8f925a8d","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%3Acmqimhb4t0000jv04tulgnnqp/complete","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_WB5UdKy75srVZ47kOSKhb","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":"Completes a ready-for-complete StableMerch UCP checkout session by processing a $50 USDC payment and submitting the prepared Printify order to production.","exampleAgentPrompt":"My StableMerch checkout session stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp is ready to complete — go ahead and pay the $50 USDC and send that Printify order into production.","exampleUseCases":[{"title":"Fulfilling a custom merch drop","prompt":"I've got a StableMerch checkout session stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp that's ready for completion — please pay with USDC and push the Printify order to production so we can start fulfillment."},{"title":"Automating agent-driven merchandise orders","prompt":"My AI storefront just prepared a StableMerch checkout for a customer's hoodie order and the session ID is stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp — complete it now and get it into the print queue."},{"title":"One-click creator merch production","prompt":"I finished setting up my merch design on StableMerch and session stablemerch:checkout:cmqimhb4t0000jv04tulgnnqp is showing ready_for_complete — can you pay the 50 USDC and send it off to Printify?"}],"resultDescription":"Returns a confirmation that the checkout session has been completed, payment of $50 USDC has been processed, and the associated Printify order has been submitted to production for fulfillment.","failureModes":["Checkout session not in ready_for_complete status — returns an error if the session is still pending or already completed","Invalid or unknown checkout session ID — returns a 404 or similar not-found error","Insufficient USDC balance — payment fails and order is not submitted","Payment protocol (x402) failure — transaction rejected or timed out","Printify order submission failure — payment may succeed but order production not triggered"],"whenToPreferThis":"Use this endpoint when a StableMerch UCP checkout session has been fully prepared and its status is exactly ready_for_complete, and you need to atomically process the $50 USDC payment and push the Printify order into production in a single call. This is the final step in the StableMerch order workflow, not for creating or modifying sessions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:38:41.261Z","isFirstParty":false}