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How do I create a client ID if I’m a developer integrating PayPal Express Checkout for a merchant?

A client ID authenticates a merchant’s account with PayPal and is required for integrating Express Checkout with the REST API. Only the account holder can set up a client ID.

If you’re a developer integrating Express Checkout on behalf of a third-party merchant, ask the merchant to share their client ID with you. If the merchant hasn’t set up a client ID, they’ll need to create one by completing the steps described in Get credentials.
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