---
title: "Register a test card by BIN + last four"
method: POST
path: "/admin/self-billing/test-cards"
tags: ["Admin Self-Billing"]
---

# Register a test card by BIN + last four

`POST /admin/self-billing/test-cards`

Idempotent on the mask: re-adding a known pair updates its label and reactivates it. Classification is retroactive — every charge that card ever made counts from this moment on.

## Response `201`

---

[API](https://skmtc.dev/miaai/apis/backend-template-api.md) · [All operations](https://skmtc.dev/miaai/apis/backend-template-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/miaai/backend-template-api/revisions/2a8d88a5124f/schema)