I have to implement a COD transaction fee and I'd like to use scripts.
I added a new shipping method is "Shipping + COD" and I'd like to filter the allowed payment methods to only COD if that payment method is applied.
Unfortunatelly I didn't find a solution. Can anybody help me?
There is an example payments script to get started
Keep in mind there's no passing information from a shipping script to a payments script and each has it's own non-global methods.
Some methods can only be used in line item scripts.
Meaning in a payment script .shipping_rates is not useable , further afaik there's no property clearly indicating which shipping rate was selected.
Cart attributes are also not accessible https://help.shopify.com/en/manual/apps/apps-by-shopify/script-editor/limitations#cart-checkout-attr...