Function: Get customer download permissions from the database.

Function: Get customer available downloads.

Function: Checks if the current user has a role.

Function: Checks if a user has a role.

Function: Checks if a user has a certain capability.

Function: Get past orders (by email) and update them.

Function: Order payment completed – This is a paying customer.

Function: Checks if a user (by email or ID or both) has bought an item.

Function: Login a customer (set auth cookie and set global user object).