# Function: buildRefundCrowdfundMsg()

> **buildRefundCrowdfundMsg**(`creator`, `collectionId`, `details`, `amount`): `MsgEnvelope`

Defined in: [packages/bitbadgesjs-sdk/src/core/crowdfunds.ts:389](https://github.com/BitBadges/bitbadgesjs/blob/master/packages/bitbadgesjs-sdk/src/core/crowdfunds.ts#L389)

Build the contributor-side refund tx — fires the refund approval to
pull funds back out of escrow. Single MsgTransferTokens.

## Parameters

### creator

`string`

### collectionId

`string`

### details

[`CrowdfundDetails`](https://docs.bitbadges.io/sdk/reference/interfaces/crowdfund-details)

### amount

`bigint`

## Returns

`MsgEnvelope`