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Have exisiting OSC 2.3.1 store up and running with multiple checkout methods. i need google checkout AND checkout by amazon added to the list and functioning properly as a payment module under OSC. user must be able to use GC or amazon as a potential payment method in addition to the others i currently offer. order will be created in OSC by GC API. shipping is calculated by my store which needs to pass to GC & amazon. i also use Discount coupons which need to recognized by GC and amazon. I had amazon working successfully on OSC 2.2 but after upgrading to 2.3.1 i was unable to get it to work.
i have done all prior PHP/Mysql modifications but just had a baby and have no time to work on this hence i'm farming it out.