payment.overpaid

Same shape as payment.completed, with an excess field. The full amount — expected plus excess — always settles to your own wallet; Send Chain never retains the difference.

Payload (data)

{
  "livemode": false,
  "paymentId": "pay_test_00000000",
  "paymentRequestId": "req_test_00000000",
  "origin": { "type": "link", "id": "lnk_test_00000000", "title": "Sample link" },
  "supporter": { "id": "sup_test_00000000", "handle": "sample_supporter", "message": "Test payment" },
  "asset": "USDC",
  "chain": "base",
  "onchainAmount": "15000000",
  "feeAmount": "75000",
  "decimals": 6,
  "fiatValue": { "minor": 1500, "currency": "USD" },
  "rateBasis": "Locked",
  "txRef": "0xtesttx",
  "confirmations": 12,
  "completedAt": "2026-09-13T00:00:00Z",
  "excess": "250000"
}

See Webhooks overview for the envelope, headers, and signature verification shared by every event type.