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Developer builds deduplication logic into CRM intake to prevent duplicate contacts

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A developer shipped a headless JSON intake endpoint and a 'Get Notified' marketing form simultaneously, adding a fourth lead-capture channel to an existing CRM. The key engineering challenge was handling repeat submissions from the same person across different sites and time periods, which can silently bloat a contact database with duplicates. The endpoint uses a token in the URL path to identify the tenant, removing any request-body field that a bad actor could manipulate to redirect leads into another account. Submissions are queued and acknowledged with an HTTP 202 response rather than processed synchronously, ensuring no lead is lost during slow downstream operations. The design also enforces JSON responses regardless of the client's Accept header, making integration more reliable for developers building their own clients.

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Developer builds deduplication logic into CRM intake to prevent duplicate contacts · ShortSingh