> ## 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.

# BulkTransferEndpointInput

> One endpoint (the source or destination) of a bulk transfer.

**Input object**

One endpoint (the source or destination) of a bulk transfer. Set EXACTLY ONE of operator or
externalReferenceId: operator true means your application's configured payout account;
externalReferenceId names a connected user. Both-set or neither-set is rejected.

## Input fields

<ParamField body="operator" type="Boolean">
  Set true to use your application's operator payout account as this endpoint. Mutually exclusive
  with externalReferenceId.
</ParamField>

<ParamField body="externalReferenceId" type="String">
  The externalReferenceId of a connected user to use as this endpoint. Mutually exclusive with
  operator.
</ParamField>

<ParamField body="userCashBalanceId" type="UUID">
  The user's spend account for this side of the transfer. Only valid alongside
  externalReferenceId (the operator endpoint's account is fixed by your payout configuration).
  Required when the item would otherwise be ambiguous — a source user whose grant permits several
  spend accounts, or a destination user with several accounts at the source's sponsor bank and no
  default. Omitted, it defaults to the single eligible account, else the user's default one.
</ParamField>