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

# Create Payin

> Creates a new payin.

### Body

<ParamField body="externalId" type="string">
  Client reference id (must be unique per company).
</ParamField>

<ParamField body="onBehalfOf" type="string" required>
  User/customer reference.
</ParamField>

<ParamField body="amount" type="number" required>
  Amount to be paid.
</ParamField>

<ParamField body="developerFee" type="number">
  Optional developer fee amount.
</ParamField>

<ParamField body="source" type="object">
  Optional source details.
</ParamField>

<ParamField body="destination" type="object" required>
  Destination details.
</ParamField>

<ParamField body="deductFromBalance" type="boolean">
  Whether to deduct from balance.
</ParamField>

### Response

Returns a payin object.

### Error Responses

<ResponseExample>
  ```json 409 theme={null}
  {
    "success": false,
    "error": "externalId was already used"
  }
  ```
</ResponseExample>