Hello again, "Would the 'developer account' be the business account of the owner of the website who wants to be able to receive payments?" You would login to our developer site at https://developer.paypal.com/developer/applications using the same email address and password that is used to login to the business account at https://www.paypal.com Once logged-in using the link above, you should be on the "My Apps & Credentials" page, which is where you would create REST applications. Once on the page, click the "LIVE" tab to choose our live environment and then choose "create app". Give the REST application a name of your choosing and when created, you'll be shown the REST application details, which will contain a "client_id" and "client_secret" used for authentication against our REST API's. Copy the provide "client_id" and paste it into the button code, replacing the default value of "sb". Keep the "client_secret" secured and don't share it with anyone. There is also a help article available on this topic here : https://www.paypal.com/us/smarthelp/article/how-do-i-create-rest-api-credentials-ts1949 Let me know if you have further questions. Thanks !
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