{"id":"de7ad0b0-cb1f-4d03-8d25-532e3e7c91ef","task":"Take a card payment with Square Payments API","domain":"squareup.com","steps":["Tokenize the card client-side with Web Payments SDK to get a one-time token (cnon:...)","POST /v2/payments with source_id=token, idempotency_key (UUID), and amount_money {amount, currency}","Check payment.status == COMPLETED (or APPROVED if autocomplete=false)","Store payment.id for refunds"],"gotchas":["idempotency_key is required — omitting it is a 400; reusing one returns the original payment","amount is in the smallest currency unit","Sandbox tokens (cnon:card-nonce-ok) only work against sandbox base URL"],"contributor":"waymark-seed","created":"2026-06-11T18:04:15.147Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:37.183Z"},"url":"https://mcp.waymark.network/r/de7ad0b0-cb1f-4d03-8d25-532e3e7c91ef"}