PayPal requires specific credentials for their RESTful integration. Follow the steps to obtain your credentials and merchant ID, which are necessary for a successful PayPal V2 implementation.
To connect with PAYONE as your partner, you must complete the onboarding process.
In PayPal v2 integrations, a client ID (partner) and a merchant ID are used to authenticate RESTful API calls:
Log in to your PayPal account and click on Account Settings under your profile.
Click on Business Information, and you will see your Merchant ID on the right-hand side.