I have followed (http://www.zen-cart.com/index.php?main_page=page&id=15) to set up Express Checkout module in my zen-cart store.
When I go to step3, on the page of API Access, there is an option that I don't know what to do with it: "Accept payments from your online stores before setting up APIs / Enable Express Checkout to accept payments from your online stores right away. You can set up API permissions or credentials later. "
Here are 2 options below, what is the difference???:
1. Accept PayPal payments before API permissions or credentials are set up
2. Block payments from uncredentialed shopping carts
As I understand, in order to get payment from my store to my payPal account, I need to set up API anyway, how come there is possibility to get payments from online stores or shopping carts before you set up API permissions? In this case, how to link my PayPal and my Store?
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