Smart Buttons EC integration
IPN
Combat Plugin Conflicts
Combat Custom Themes
Leave integration future proof for EC and cards
Integrate with woo commerce subscriptions for RP
Webhooks?
ISU
Good Error Handling
debug mode
coupons
other discounts?
PayPal Credit/Banners
mobile version?
sandbox
fraud filters
line items
review pages
shipping
email notifications for errors/payments etc
invoice prefix
cart/minicart
logos/banners
save abandoned checkouts