# Getting Started
source: https://developer.mastercard.com/merchant-match-tool/documentation/getting-started/index.md

## Before You Start {#before-you-start}

Before you access Merchant Match Tool, please ensure that you have reached out to your Mastercard Account Manager and have completed an MMT Enrollment Form. If you do not have an Account Manager, please reach out to [Commercial.Support@Mastercard.com](mailto:Commercial.Support@Mastercard.com)

Your Mastercard representative will help guide you through this process prior to your usage of the API.

## Good to Know {#good-to-know}

Once you have completed your enrollment in Merchant Match Tool (MMT), you will then need to create a new project on Mastercard Developers. Following this you will need to share your Customer keys generated during the Sandbox and Move to Production steps with the MMT team. You can find more information about this process by following the [Tutorials and Guides](https://developer.mastercard.com/merchant-match-tool/documentation/tutorials-and-guides/). It can take up to 5 days for your keys to be registered. In order to understand your options for integrating with the MMT service it is recommended that you familiarize yourself with the [API basics](https://developer.mastercard.com/merchant-match-tool/documentation/api-basics/index.md).

Please note that the data returned in the Sandbox environment is placeholder data. While the data types reflect what will be returned in a production request, the underlying matching algorithm is not accessed. Thus, responses in the sandbox environment may change between requests.

The MMT API provides two ways to search the Supplier database using APIs, one for single search requests and the other for multiple search requests. A user can make a single search API call to search for one Supplier. Similarly, a user can make a multiple search API call to search for a large array of Suppliers with one request. Please note that for each client, only 5 concurrent single search requests will be processed at a time. Any additional single search requests (up to 10) will be put into the queue. For multiple search API, only one request will be processed for each client at a time. Any additional multiple search requests sent by the same client while another one is being processed, will be rejected with an error message. Also, the maximum number of queries allowed within one multiple search API request is limited to 100.