Minor improvement to asset_sync init
Cleaner payment classes
Move methods to CheckoutPayment
Payment belongs to PaymentGateway
Fix broken migration
Payment belongs to PaymentGateway
Test cleanup
Remove new listing seller commission
Improve JS calculations
Payment gateway, total commission
Calculate gateway fee
Calculations
Seller commission
Fix minor issu in payment relations
Sum fixed
Cleanup payment math
Clean tests a bit
default_sum
Minor changes to commission calc
A lot of small fixes and test fixes