Field matching is not event identity
One person can submit more than once, while an email address or phone number can be edited or normalized differently.
CRM lead deduplication API
Prevent retry duplicates before they reach the CRM.
Use one source event identity, payload and destination fingerprints, and a stored delivery receipt so webhook retries do not create another CRM contact.
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A successful automation run is not proof of delivery.
CRM duplicate rules usually compare mutable contact fields such as email or phone, while webhook retries represent the same business event. A request can also reach the CRM even when the sender times out before receiving the response. Retrying that ambiguous handoff with a new identity can create another contact, task, or notification. Duplicate-safe delivery needs the original source event ID, the same body and destination, and a receipt that survives every attempt.
Original form, call, booking, or conversation ID -> LeadProof deduplication boundary -> authorized CRM webhookTimeouts hide completed writes
The CRM may accept a request after the sender stops waiting, making a blind retry unsafe.
Retry branches drift
A new UUID, timestamp, body, or destination turns recovery into a different delivery instead of the same business event.
Implementation
Put LeadProof in the delivery path.
Keep the tools that create and process the lead. Standardize only the fragile handoff between them.
Open sandbox instructions →- Choose the durable source submission, call, booking, conversation, or opportunity event ID before the first delivery attempt.
- Send it as the same non-sensitive Idempotency-Key with the authorized lead body and public HTTPS CRM destination.
- Store the LeadProof receipt ID beside the source event and reuse the original key for every automatic retry.
- After a final failure, replay only with the same key, body, destination, and X-LeadProof-Replay: true so fingerprint mismatches are rejected before delivery.
POST
https://leadproof.jessesay.chatgpt.site/api/v1/leadsAuthorization: Bearer lp_live_your_key
Idempotency-Key: stable-source-lead-id
Content-Type: application/json
{
"destination": "https://your-crm.example/webhook",
"name": "Alex Morgan",
"email": "alex@example.com",
"source": "crm deduplication"
}Questions
What teams ask before adding LeadProof.
Does this replace the CRM's duplicate rules?
No. Keep destination-specific duplicate rules as a backstop. LeadProof identifies the original business event before the request reaches the authorized CRM webhook.
What happens when the same completed request is sent again?
LeadProof returns the stored delivery state and receipt for that Idempotency-Key instead of forwarding the same event again.
What if a retry changes the body or destination?
LeadProof rejects the idempotency conflict before delivery because the stored payload or destination fingerprint no longer matches.
See the gaps in your real workflow.
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