How to process customer data post-purchase in an app?

Hi,

I’m trying to develop a Shopify app which links store owners with a web app.

What I’d like to do is catching the customer data after he buys something from a Shopify store.

It seems that webhooks are working, but i’d like to make things very easy for store owners.

What I’d like to ask is if webhooks are the only way to do this or if there is some other way which simplifies things?

For example maybe app extension?

Thanks in advance