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After generating your key pair, send your public key PEM to Blink to register as a merchant.
FieldValue
merchantIdYour unique UUID (assigned by Blink)
displayNameYour merchant display name
algorithmECDSA_P256_SHA256
statusACTIVE
publicKeyYour PEM-encoded public key
Once registered, Blink’s hosted flow verifies every signed payment link your signer produces by fetching your public key from the API (GET /v1/merchants/{id}/public-key).

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What you receive

After registration, Blink provides your merchantId — a UUID you will configure in your signer endpoint. This ID is included in every SignerResponse so Blink knows which public key to use for verification.

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Key rotation

Your public key can be updated by contacting Blink. When rotating keys:
  1. Generate a new key pair.
  2. Send the new public key to Blink.
  3. Once confirmed, update your signer endpoint to use the new private key.
  4. The old key is deactivated immediately — do not rotate during high-traffic periods.