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Don't be afraid to ask! It can be easy to think a professional will just "know" what to do, but the truth is they aren't mind-readers. My approach goes like this: "Hi [name of escort] my name is [my name]. I love what you said in your ad/am a big fan of your work (as appropriate) and would like to pursue whether we are compatible. I like to do [list the things I want to do - this is a good place to include your love of feet] and it is really important that we [tell him what is really important to you]. Do you think you could get into this/do you think we are a good match/etc."
If a guy doesn't want to answer or is evasive he is raising a red flag. Give him a second chance and if he is still evasive, consider whether it is time to move on. 

I frequently have some back-and-forth about the session in advance of it taking place. Not cyber-sex but going over things we both like/don't like/are absolute showstoppers. However, I'm also careful to avoid turning the exchange into sex-via-text. As @pubic_assistance's post implies, there is a limit to the amount of off-the-clock time should be spent discussing specifics. Another way to approach the situation is to ask if the provider would be willing to have a 15-minute call/message exchange in return for one quarter of his hourly rate. 

@newdad, you might want to review the reviewers' RM profiles and pay particular attention to the date they signed up and other reviews they have left. If a guy has been a long-term member, he is likely more reliable than one who joined just a few days prior to the review.

A few things:
Cash App is not a Google product. It is a product of Block, Inc which was formerly known as Square (now one of Block's divisions). The best place to learn about safeguarding yourself and your funds when using Cash App is their Support page. There you will find a plethora of information.