Marketplace Protocol

The _Marketplace Protocol_ is a set of API requests and definitions to help you integrate external sellers into a VTEX marketplace as well as external marketplaces into VTEX sellers. ## External Seller Here you will find the endpoints involved in the integration between a VTEX marketplace and an external seller. Note that some of these requests are typically sent by the seller while others are received. | **Request** | **From** | **To** | |-|-|-| | [Fulfillment simulation](https://developers.vtex.com/vtex-rest-api/reference/fulfillment-simulation) | Marketplace | Seller | | [Order placement](https://developers.vtex.com/vtex-rest-api/reference/order-placement) | Marketplace | Seller | | [Authorize fulfillment](https://developers.vtex.com/vtex-rest-api/reference/authorize-fulfillment) | Marketplace | Seller | | [Marketplace order cancellation](https://developers.vtex.com/vtex-rest-api/reference/marketplace-order-cancellation) | Marketplace | Seller | | [Send invoice](https://developers.vtex.com/vtex-rest-api/reference/send-invoice) | Seller | Marketplace | | [Send tracking information](https://developers.vtex.com/vtex-rest-api/reference/send-tracking-information) | Seller | Marketplace | | [Update tracking status](https://developers.vtex.com/vtex-rest-api/reference/update-tracking-status) | Seller | Marketplace | | [Cancel order in marketplace](https://developers.vtex.com/vtex-rest-api/reference/cancel-order-in-marketplace) | Seller | Marketplace | For a detailed explanation of the steps required to develop a custom connector to sell products from an external seller in your storefront, check out our complete [External Seller Integration Guide](https://developers.vtex.com/docs/guides/external-seller-integration-guide). ## External Marketplace In this section, you will find the endpoints involved in the VTEX integration between an external marketplace and a VTEX seller. | **Request** | **From** | **To** | |-|-|-| | [VTEX Mapper Registration](https://developers.vtex.com/vtex-rest-api/reference/vtex-mapper-registration) | External marketplace | VTEX system | | [Send Category Mapping to VTEX Mapper](https://developers.vtex.com/vtex-rest-api/reference/send-category-mapping-to-vtex-mapper) | External marketplace | VTEX system | | [Authorize fulfillment](https://developers.vtex.com/vtex-rest-api/reference/authorize-fulfillment) | Marketplace | Seller | | [Place fulfillment order](https://developers.vtex.com/vtex-rest-api/reference/place-fulfillment-order) | External marketplace | VTEX Seller | | [Authorize dispatch for fulfillment order](https://developers.vtex.com/vtex-rest-api/reference/authorize-dispatch-for-fulfillment-order) | External marketplace | VTEX Seller | For a detailed explanation of the steps required to develop a custom connector to become an external marketplace for VTEX sellers, check out our complete [External Marketplace Integration Guide](https://developers.vtex.com/docs/guides/external-marketplace-integration-guide).