Would my app be required to use IAP

I've been asked by my company to build an app. The core business is bookkeeping for individuals and small businesses. We charge hourly as well as offer a monthly membership. The majority of the bookkeeping would happen offline directly between the accountant and the customer. However we would want to use the app to show dashboards, some comms, etc.

The concern is, would Apple consider the service being consumed within the app? We want to very much avoid IAP, and use our own checkout flow, I think we'd be okay, but I don't know. .

I think we would fall under 3.1.3(e).

"Per section 3.1.3(e) Goods and Services Outside of the App: If your app enables people to purchase physical goods or services that will be consumed outside of the app, you must use purchase methods other than in-app purchase to collect those payments, such as Apple Pay or traditional credit card entry."

Any insight or advice would be appreciated, thank you

Would my app be required to use IAP
 
 
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