Voscur: payment processor setup

Issue	Budget	Actual	Balance	Jul 2020
Payment processor setup #2	0.5	0.3	0.2	0.3
Set up Stripe payment processor #18	0	0.1	-0.1	0.1
Integrate Stripe as a payment processor #19	0	0	0
Total	0.5	0.4	0.1	0.4