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Attach a generated signal card to a stored score, or claim an anonymous signal card for the caller’s account after sign-up. Symmetric with /api/score/link but for the IC-tier signal card flow. 
curl -X POST https://app.dacard.ai/api/signal-card/sigc_xyz/link \
  -H "Authorization: Bearer $DACARD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "scoreId": "scr_xyz" }'
PropertyValue
AuthRequired
IdempotentYes (second call is a no-op)

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Body

FieldTypeRequiredNotes
scoreIdstringnoPass when linking the signal card to an existing stored score. Otherwise the card is just claimed against the user’s account.

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Errors

StatusCodeWhen
401AUTH_REQUIREDNo session.
404Signal card not foundBad id.
409Already linked to another accountCard was already claimed.
500INTERNAL_ERRORWrite failed.