CommerceTools

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You can create and delete API Clients in the Merchant Center for accessing commercetools Composable Commerce APIs.

To create an API Client, do the following:

1. In the Merchant Center main menu, go to Settings > Developer settings.
2. Click Create New API Client.
3. In the Name field, enter a name for your API Client. The API Client name must be unique and differ from other names.
4. Select individual permissions (scopes) for the API Client or a template (with pre-selected scopes) from the drop-down.

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Some scopes automatically include a related scope. For example, if you select the Manage Customers scope, the View Customers scope is automatically selected. For more information, see Scopes.

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You can only set scopes when creating an API Client.

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5. If needed, add scopes for specific Stores in your Project. For more information, see (Create an API Client with Store scopes.)
6. Click Create API Client.
7. Copy client_id, secret, scope, API URL, and Auth URL to a safe location, as they are displayed only once. Alternatively, copy or download one of the language-specific environment presets. We recommend copying at least the cURL version for all API Clients to generate an access token.

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Reference:
https://docs.commercetools.com/merchant-center/api-clients
https://docs.commercetools.com/api/projects/api-clients