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v5

latestOpenAPI 3.1.0Proprietary2026-08-011476181.4 MB
Sandbox

Simulate a card authorization

Simulate an inbound card authorization in the sandbox environment. Drives the same internal authorize + reconcile paths the card issuer would call in production, so platforms can exercise Grid's decisioning + funding-source pull behavior end-to-end without an external network round-trip.

The decisioning outcome is controlled by the last three characters of merchant.descriptor:

| Suffix | Outcome | | ------ | ------- | | 002 | Decline — INSUFFICIENT_FUNDS (the pull on the funding source fails) | | 003 | Decline — CARD_PAUSED (intended to verify a frozen card refuses auths) | | 005 | Delayed pull (~30s) — exercises the PENDING → CONFIRMED path | | 006 | Pull succeeds but the confirmation event reports FAILED — exercises the high-urgency EXCEPTION alert | | any other | Approved |

Production returns 404 on this path.

post/sandbox/cards/{id}/simulate/authorization

Path parameters

idstring required

The id of the card to simulate an authorization against.

Request body

amountinteger required

Authorization amount in the smallest unit of currency (e.g. cents for USD).

Example request

{
  "amount": 1250,
  "currency": {
    "code": "USD",
    "name": "United States Dollar",
    "symbol": "$",
    "decimals": 2
  },
  "merchant": {
    "descriptor": "BLUE BOTTLE COFFEE SF",
    "mcc": "5814",
    "country": "US"
  }
}

Response

Simulation accepted. The resulting card operation is delivered asynchronously via the issuer's events webhook. Returns the issuer transaction token that correlates the simulated event.

issuerTransactionTokenstring required

The card issuer's transaction token for the simulated event. Correlates the eventual webhook-delivered card operation back to this simulate call.

Example response

{
  "issuerTransactionToken": "f3a1c2d4-5b6e-7890-abcd-ef0123456789"
}