Integration guides per payment method:
Alipay
BitPay
BCMC
Card
Creditclick
Dummy
Entercash
EPS
Giropay
Ideal
Multibanco
MyBank
OpenNode
Paypal
Paysafecard
PayU
P24
SEPA
Skrill
Sofort
TripleA
Trustly
TrustPay
UnionPay
Volt
WeChatPay