> ## 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.

# DefaultFundingSource

> DefaultFundingSource represents an account's default funding source: the primary payment method (a bank account, charged first) and the backup payment method (a bank card, charged if the primary can't be charged).

**Object**

DefaultFundingSource represents an account's default funding source: the
primary payment method (a bank account, charged first) and the backup payment
method (a bank card, charged if the primary can't be charged).

## Fields

<ResponseField name="primary" type="BankAccount">
  The primary funding source (bank account) charged first for transactions.
  Null if no primary is set (or the stored primary is not a bank account).
</ResponseField>

<ResponseField name="backup" type="BankCard">
  The backup funding source (bank card) charged if the primary can't be charged.
  Null if no backup is set (or the stored backup is not a bank card).
</ResponseField>