> For the complete documentation index, see [llms.txt](https://docs.toomuchmedia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.toomuchmedia.com/api/api-endpoints/external-transaction/api-external-transaction-void.md).

# /api/external‑transaction/void

## POST /api/external-transaction/void

> {% hint style="warning" %}\
> \*\*NOTICE:\*\* NATS Pro is required to use this API.\
> {% endhint %}\
> \
> Record a Void Transaction

```json
{"openapi":"3.0.2","info":{"title":"API Specification","version":"v1"},"tags":[{"name":"/api/external-transaction/void"}],"security":[{"api-key":[],"api-username":[]}],"components":{"securitySchemes":{"api-key":{"type":"apiKey","in":"header","name":"api-key"}},"schemas":{"post_external-transaction_void":{"type":"object","properties":{"success":{"type":"boolean"}},"required":["billerid","amount","currency","memberidx","related_transactionidx"]}}},"paths":{"/api/external-transaction/void":{"post":{"description":"{% hint style=\"warning\" %}\n**NOTICE:** NATS Pro is required to use this API.\n{% endhint %}\n\nRecord a Void Transaction","tags":["/api/external-transaction/void"],"parameters":[{"name":"billerid","in":"query","schema":{"type":"integer"},"required":true},{"name":"amount","in":"query","schema":{"type":"string"},"required":true},{"name":"currency","in":"query","schema":{"type":"string"},"required":true},{"name":"memberidx","in":"query","schema":{"type":"string"},"required":true},{"name":"related_transactionidx","in":"query","schema":{"type":"string"},"required":true},{"name":"transactionidx","in":"query","schema":{"type":"string"},"required":false},{"name":"partial","in":"query","schema":{"type":"string"},"required":false},{"name":"transaction_passthrough1","in":"query","schema":{"type":"string"},"required":false},{"name":"transaction_passthrough2","in":"query","schema":{"type":"string"},"required":false},{"name":"transaction_passthrough3","in":"query","schema":{"type":"string"},"required":false},{"name":"transaction_passthrough4","in":"query","schema":{"type":"string"},"required":false},{"name":"transaction_passthrough5","in":"query","schema":{"type":"string"},"required":false},{"name":"time","in":"query","schema":{"type":"integer"},"required":false}],"responses":{"200":{"description":"success","content":{"text/php":{"schema":{"$ref":"#/components/schemas/post_external-transaction_void"}},"application/json":{"schema":{"$ref":"#/components/schemas/post_external-transaction_void"}},"application/xml":{"schema":{"$ref":"#/components/schemas/post_external-transaction_void"}}}}}}}}}
```