App reviews, troubleshooting, and recommendations
Hello Guys,
We need to create a custom payment app which is supposed to process the transaction of FSA/HSA eligible products. We have our hosted payment page ready that receives base64 encoded data of Order ID and merchant key from merchant store website and process the transaction.
So our requirement here in shopify is : Our proposed payment app should create a payload and send it to our 'createOrder' API endpoint. Then API will send back a Redirect URL in response which consists link to our gateway's hosted page along with base64 encoded data(Order ID and Merchant Key) as query parameter.
We come to know that we need Shopify's 'Offsite Payment Extension' method to develop this custom payment gateway. For this we need to configure Session Payment URL to which Shopify will send Order, Payment, Billing and Shipping Info as HTTP POST. So we assume this is the page (Session Payment page URL) where we can build payload for our 'createOrder' API and send it to API. But somehow We are not able to access Merchant Key and Order items detail on this page. So we need Order Item's meta data like GTIN, EAN etc for payload building.
Please guide us how can we get Order Item details , merchant key on this session payment URL so that we can proceed further.
I'm tying to create a similar app, mine is a bit simpler but still I've not found a clear path to develop this custom payment app for shopify.
I don't understand why the documentation is very general on this topic.
Hi Thiruit4,
Did you ever get a resolution to your question above? We are looking into what it takes to accept the FSA/HSA payments at checkout. Thanks
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