> ## Documentation Index
> Fetch the complete documentation index at: https://docs.synctera.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How can I check the reason why an end customer was unable to make a payment?

> Given a declined transaction, the reason can be found using our Transactions API.

If you're using v0, it can be found using the "Get a pending transaction" endpoint, under data->reason.

If you're using v1, it can be found using the "Get a transaction by ID" endpoint, under decline->reason.