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Step 1: Add a Merchant ID to your Apple Developer account

To process payments, you need to add a Merchant ID to your Apple Developer account.

Log in to your Apple Developer account at https://developer.apple.com.
Click Certificates, Identifiers & Profiles.
The page loads and presents a menu.
Click Merchant IDs.
Click + in the upper-right corner.
Set a Merchant ID Description and Identifier. The identifier should include the merchant.com.adyen prefix. For example: merchant.com.adyen.merchantAccount

For test accounts, we recommend adding .test to the identifier.
Click Continue, and verify that the entered information is correct.
Copy the merchant identifier, and click Register.
Email your merchant identifier and Adyen web service username (ws@Company.[YourCompanyAccount]) to support@adyen.com. We will reply with a CSR (Certificate Signing Request) that you will use to create a Payment Processing Certificate.