# Function: buildPurchaseProductMsg()

> **buildPurchaseProductMsg**(`creator`, `collectionId`, `product`): [`PurchaseProductMsg`](https://docs.bitbadges.io/sdk/reference/interfaces/purchase-product-msg)

Defined in: [packages/bitbadgesjs-sdk/src/core/products.ts:349](https://github.com/BitBadges/bitbadgesjs/blob/master/packages/bitbadgesjs-sdk/src/core/products.ts#L349)

Build the MsgTransferTokens that purchases one unit of a given product.
Uses `precalculateBalancesFromApproval` so the chain figures out the
mint balance from the approval definition. Routes to the burn address
if the product is `burnOnPurchase` (consumable goods), else to creator.

## Parameters

### creator

`string`

### collectionId

`string`

### product

[`ExtractedProduct`](https://docs.bitbadges.io/sdk/reference/interfaces/extracted-product)

## Returns

[`PurchaseProductMsg`](https://docs.bitbadges.io/sdk/reference/interfaces/purchase-product-msg)