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Before you can add a partner to your store's API access list, the partner must provide you with their Partner ID. If you want to make your own API calls, you must add your own Partner ID to your store's API access list. Learn how to apply for a Partner ID.
Note: Merchant Solutions APIs are available with Merchant Solutions Standard, Professional, and Store v.1 packages.
Once you add the Partner ID, the token will also appear for the partner in their Manage Partner Tokens tool. If needed, you can email a copy of the token to the partner.