How do I use the RP0000**** for API operations?

Hi there - I am busy trying to manage profiles in paypal manager via the API. The profile ids RP0000**** give me an error - im trying to add a custom field to the profiles so I can track which payment belongs to which users in the online user database. Currently they checkout / subscribe - but the previous dev didnt enter anything to link the two. I have email but id like a db id in the PROFILEREFERNCE field for tracking which payment belongs to which user -

I am using the angel php paypal library - by creating a new (sandbox profile) I am able to update the profile using the profileid returned, however in the exported csv file from paypal manager all i have are RP0000**** and not sure how I can/should use them to add a field?

Please - ive been trying for weeks now and noone seems to be able to assist. Also - is there a way of knowing the montly payments are in fact recurring profiles?