Have some kind of disclosure that the seller signs which acknowledges you are not representing them in any capacity even though you are a licensed agent.

Also remind them that they signed the lease in as-is condition, and while you strive to continually improve the property, you don't have direct plans to fix XYZ, however it is in your long term plan... stuff like that, it acknowledges their complains, and I'm sure you do plan on doing more stuff, just not right now.    

The bank should be able to pay the Architect directly as long as you acknowledge they are completing services for you.

I also make them sign an acknowledgment that they have reviewed selection criteria and return with application.  

Except as otherwise provided in this Contract, Buyer acknowledges that Seller is conveying the Property to Buyer in an “As Is” condition, “ Where Is” and “ With All Faults.”I would argue that you have both the right to test and the right to terminate.

Arizona law also generally only recognizes certified mail and or hand-delivered notices unless you have another means of acknowledgment. 

The "PayPal model" - of an all powerful, closed, low cost "garage shop" company, that won't acknowledge it's customer's existence or let you talk with a representative, is certainly broken here!

· Effective August 28, 2018, California AB 2219 required residential landlords to accept rent payments through a third party, if the payor provides a signed acknowledgment stating that they are not currently a tenant of the premises and that acceptance of the rent payment does not create a new tenancy with the third party.It amended Civil Code §1947.3.Civil Code §1947.3(c) provides the following sample form acknowledgement:I, [insert name of third party], state as follows:I am not currently a tenant of the premises located at [insert address of premises].I acknowledge that acceptance of the rent payment I am offering for the premises does not create a new tenancy.

I have the following blurb (for this exact same issue) as an addenda item in my lease that was also acknowledged and signed by them;"Resident acknowledges and agrees that this is a co-ed (mixed gender) and co-living house. 

Then as part of our resident move in process we change the cylinders while they are watching and have them sign a document that acknowledges it.Good Luck and Good Investing.