I require all new tenants to use it, but I have a few that use other methods due to them being tenants when I acquired the properties.Background and credit checks are easy to send to an applicant - they pay 55.00 and I get the reports quickly. 

Most clients don't want to pay that way though because the nature of the beast is at the end of the day they most likely are ending up paying for nothing.

Only thing is other than personal finance, what other methods are there for funding, buy, rehab, rent out and hold type deals.

A lot of mistakes can be made if you do not talk to the right people and use preventive maintenance to avoid problems.Multifamily rentals are a great way to use the more doors more cash flow method.

I suppose one method would be to use seller reported figures but that wouldn't be prudent for many obvious reasons. 

Any online method i can ask tenant to use that can deposit the amount to my bank account which is free for tenants and safe method for me to use. i had issue with one of the check send by tenants (not a tenant fault)and i was about to fall into scam as i tried to deposit the check online but now want to stay away from Checks. venmo/zelle doesn't allow bigger amount transfer.

They say invest when theres blood in the streets but this means we are at the mercy of mother nature. 

This method saves time and keeps a record of everything you or your employees ever told them. 

I agree with @Michael Plaks that the pricing should be discussed prior to the start of the engagement.My firm does not like the hourly invoice method because I find it can potentially cause anxiety to clients who may not know the final price.if you were a nice client and paid an hourly fee, maybe there was a lot of time towards 'setting' you up as a client(inputting your properties, prior year carryforwards, depreciation schedule, etc) which won't be a cost for you going forward.Best of luck.

However, you would need to speak/hire a securities attorney first, determine which rule you're going to use for your syndication, and then start talking to investors based on methods the ruling dictates to use.