So I customized Django-oscar, everything works fine until the payment step
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This page needs implementing within your project. You may want to use one of Oscar's payment gateway libraries:
django-oscar-paypal
django-oscar-datacash
django-oscar-gocardless
django-oscar-paymentexpress
django-oscar-accounts
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I do not want online payment, my courier will send the package and collect fees. Is it possible to config django-oscar to accept pay-on-arrival style of payment?