Hello KennethL563,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
If you’re uncomfortable with selecting All for Resource Access in Magento’s API settings, the minimum access required for the integration are the following resources:
Sales
Catalog
Customers
Stores
Please have a look and let us know if you have any other questions!
Regards,
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