# Support
source: https://developer.mastercard.com/merchant-identifier/documentation/support/index.md

## FAQ {#faq}

For instructions to sign up for the API service, please click [here](https://developer.mastercard.com/merchant-identifier/documentation/quick-start-guide/index.md). To cancel your subscription, go to [Developers Dashboard](https://developer.mastercard.com/dashboard), Click the appropriate project then select 'Delete this project' at the bottom of the project detail page. Once your project has been deleted, recurring charges for this service will end. Yes, Merchant Identifier returns robust merchant data based on various inputs from the client. The input data can be from any source, though the most common source is credit and debit transaction logs. For transaction data as input, please note the API is scheme-agnostic; for example, Descriptors can be from any source and is not limited to Mastercard-processed transactions. The sandbox is intended to be used by developers who want to explore using Merchant Identifier without formally entering into an agreement with Mastercard. It contains sample data and an ability for developers to test their code, so they can determine if the functionality offered meets their needs. Note: The Sandbox contains sample data only and does not contain live information. Merchant Identifier and the Places dataset is a global dataset and available everywhere Mastercard is accepted. The availability of specific merchant attributes may differ from country to country based on the completeness and quality of information as well as any applicable country data privacy laws.

## Get Help {#get-help}

### Contact us for technical support. {#contact-us-for-technical-support}