It basically says to other providers, that the lady saw you. Some escorts will accept the white list as a screening method/reference, others WILL NOT, and they will request the name and contact info of a provider you've recently seen. Just depends on the screening method of the lady you want to see.

and ask her if she will give you a whitelist referral.  It will probably make her more likely to do that for you if you have posted a nice review, so she knows you really enjoyed your date with her.

Swim