Fido Adapter

I have a question regarding the input for the fido adapter. I understood that they should be posterior probabilities and if we have PEPs we can change them using id score switcher. My first question is, these scores are for the PSMs right? or should they be calculated for Peptides? Second, if they are PEPs of PSMs, when using Percolator which meta value corresponds to PEP MS:1002049 or MS:1002050?