How can I integrate a local payment gateway in a Nepal-based online store?

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I am looking for solution to my problem from the experts.

I have a store operating in Nepal with no international payment gateway or widely payment gateway like shop pay, stripe, Paypal etc. We have our own local digital wallets and Bank with their own Api.
My store is facing huge issue to integrate payment gateway in my store with their api and I am not able to get their payment. I asked our local payment provider for solution but they just ask to integrate their api in my admin backend which I believe is not possible.

How to add their api in my shopify store. There is no any payment gateway available for Nepali store. Alternative solution was given before to use 2checkout which was also having problem with zipcode and address as in Nepal there is no standard zipcode and address system.

I hope I will get solution for my huge problem.

Thanks i