It depends. Sometimes the OC will just forward the pmt to the CA. Other times, they will take the $$ and then the CA will have no supporting data.
You can always ask the OC if they will agree to have the CA delete the account if you PIF. Just make sure you get it in writing

I just did this successfully, I think on Friday? Had 5 acc'ts totaling about $1300 for old med collections, spoke to the supervisor in the OC billing department and he agreed to PFD.
For a few others where the CA wouldn't PFD, I PIF'd anyway just to get them reporting paid on my CR (this is not the best COA for everyone, depends on what your immediate future plans are) and then wrote GW letters to get them deleted. Three of those are now being deleted after PIF since the OC got the letters & agreed.