Add possibility to preselect payment method and some other tweaks#1

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macolo wants to merge 9 commits intotaywa:masterfrom what-digital:master

+52-15

Commits on Jun 14, 2020

make compatible with django 2.2
Mario Colombo
committed

Commits on Jun 22, 2020

enable optional preselection of payment method
Mario Colombo
committed
add PayerNote
Mario Colombo
committed

Commits on Jun 29, 2020

support saferpay alias and an order id that includes characters
Mario Colombo
committed

Commits on Jul 23, 2020

dont automatically capture, there are setups where the payment is captured by a third party system later (for example)
Mario Colombo
committed
some payment methods such as POSTCARD do not support registering an alias
Mario Colombo
committed

Commits on Dec 13, 2020

Update gateway.py
Mario Colombo
authored

Commits on Dec 17, 2020

fix error messages
Mario Colombo
authored
fix spec version error (1.2 != 1.20)
Mario Colombo
authored