Making a Digital Key Store

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I'm looking into setting up a digital key store on shopify, as far as I'm aware that's possible. I have a few questions regarding that:

1) Most digital key providers use APIs for their work, usually PHP-based ones. Is it possible to integrate them into Shopify? If so, what do I need for that? Should I hire a developer for that?
2) In Russia we have a law regarding receipts for digital purchases, we have some services which basically provide an online cash register which sends a receipt to the customer. They also use their own API. Is it possible to integrate them as well?