Adviced needed: discount on payment method

[Alessandro Reichert]

Hi guys,

In some countries this may not be useful but in Brazil we have a range from 0 to 20% of the order as a fiancial cost.
This bring a need to give a discount based on the payment method.

Someone has any idea on how this could be done?

Some requirements:
- This discount must be cumulative to other offers / discount coupons;
- In this case, it should be applied in the order total instead of in the individual products;
- It should be shown on the order details;

Any suggestion will be apreciated.

Best regards,
Alessandro.

[David Winterbottom]

This will be a little fiddly as your requirements conflict with how discounts are "normally" applied (at least in my experience). Oscar's offers aren't really designed to be used cumulatively - if a product has been discounted by one offer, it is normally unavailable for further discounts.

It also sounds unusual to not apply the discount to individual products. What if a product is returned for refund? It might be tricky to work out how much to refund.

You're best bet is to modify the build_submission method:https://github.com/tangentlabs/django-oscar/blob/master/oscar/apps/checkout/session.py#L159

to apply your custom discount to the basket once the payment method is known. I'm not 100% sure on the best way of applying a discount at this stage - you might be able to add a new result instance to basket.offer_applications.

Good luck.

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David Winterbottom
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[nor...@1kdims.com]

Hi Alessandro,

I had somewhat similar requirements. As David suggested I also used the build_submission method. Also I extended my order model with a relation to a custom payment_option model. In the build_submission method you could use custom Calculators [0] to apply your payment discount logic. Extending the order model did quite a good job for me because I also needed all the information later for sending emails and other backoffice related stuff.

Cheers,

norman

[0] https://github.com/tangentlabs/django-oscar/blob/master/oscar/apps/checkout/calculators.py