I've always been super confused when it comes to mapping between PayPal's APIs (both "Classic" and the new REST APIs) and the actual PayPal business products (the account level ones seem to be Standard, Advanced, and Pro; there's also Payflow Link and Payflow Pro which acts as a gateway; and then Express Checkout which seems to straddle everything).
Specifically, do the "accept and store credit card" bits of the REST API require an Payments Advanced or Payments Pro account (the ones that require a monthly fee), or is any standard business PayPal account eligible to use them?