Checkout reference.
To use the payment methods:
from salesman.checkout.payment import payment_methods_pool
basket_payments = payment_methods_pool.get_payments('basket')
order_payments = payment_methods_pool.get_payments('order')
payment = payment_methods_pool.get_payment('pay-in-advance')
salesman.checkout.payment.PaymentError
salesman.checkout.payment.PaymentMethod
salesman.checkout.payment.PaymentMethodsPool
salesman.checkout.payment.payment_methods_pool
salesman.checkout.utils.validate_address
salesman.checkout.serializers.PaymentMethodSerializer
salesman.checkout.serializers.CheckoutSerializer