As I mentioned before, I have a second question:
I have a membership-based training site with three tiers of membership:
For the 'free' membership, I don't want the user to see a PayPal button at all, lest it scare them away. For the 'Premium' and 'Pro' memberships, I have enabled both of the PayPal Add-Ins for membership (i.e. '...with Single Payments' and '...with Subscriptions'), and I'm hoping to allow users to choose whichever they prefer.
I am currently using PayPal sandbox mode to test the site.
I have several questions:
(a) When I click the button for 'Single Payments', the PayPal process works fine, and takes me all the way to the PayPal 'transaction complete' page, but no further. The user level is NOT added to the user. Is this a limitation of the sandbox, or is something not working properly?
(b) When I click the button for 'Subscriptions', the PayPal payment process throws up an error, saying that an 'invalid button' was used to access the page. Any ideas what could cause this?
(c) Since my Free membership level requires no payment, I don't want my users to see a PayPal button, because this implies that they will be required to give their credit card information. Is there a way to create a link to sign up for the Free subscription using an arbitrary button graphic?
Your help is much appreciated!