I'm trying to implement recurring payments with PayPal in PHP. I found this example, which I'm looking into, but I need some API credentials. I created a PayPal sandbox account, and from there I created a merchant account. I'm trying to get the API credentials for that sandbox merchant account to replace the values in the example, but I can't find where. All the guides I find point to non-existant parts of the sandbox user interface. Does anyone know where I can find the API credential details for sandbox merchant accounts?
Thanks.