---
title: "Generate Card/customer External ID"
method: PUT
path: "/cardNumber"
---

# Generate Card/customer External ID

`PUT /cardNumber`

## Request body

- object
  - `cardNumber` string, required — Card number to update. The specified card must exist.
  - `cardExternalId` string, required — External system reference/id to associate with the card.

## Response `200`

200

- object
  - `entity` string
  - `warnings` unknown[]
    - unknown

## Other responses

- `400` — 400

---

[API](https://skmtc.net/capillarytech/apis/sample-api.md) · [All operations](https://skmtc.net/capillarytech/apis/sample-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/capillarytech/sample-api/revisions/de241f2ed9b3/schema)