There was an onboarding phase, which was mostly about uploading our financial docs and answering questions.

I've asked my clients a similar question and have developed tools for them to minimize this, but I find there are a few different types of clients.Manager managed - these folks have no issues as they simply upload their year end statement from their property manager, their 1098 mortgage statement and any other one-off expenses they may have paid for outside of the management company. 

We receive countless gifts and thank you cards from borrowers all over USA. 

They look at your credit profile and get you business lines of credit and credit cards.

I forged ahead, moved into the house and used credit cards to partially improve the property before they maxed out. 

What about Debit Cards attached to a checking account?

I do direct booking through the Houfy website, taking credit card payment by Square. 

I don't take credit cards but I believe stripe does.   

I like the app, but wish I could upload a CSV rather than manually enter time for each day.

Credit cards have the same limitation on the amount you can borrow and will likely end up costing more than private lenders.