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

# SetBackupFundingSourceInput

> Input type for setting an account's backup funding source.

**Input object**

Input type for setting an account's backup funding source. The bank card must
belong to the account and be ACTIVE.

## Input fields

<ParamField name="bankCardId" type="UUID!" required>
  The ID of the bank card to set as the backup funding source.
</ParamField>