Child Support Enforce contacted before hearing

I have a girl friend who moved out of the residence and took the child and move to another apartment,i have filed a pro se custody case and waiting to complete the mediation process.
Received a letter last week from child support enforcement asking me to come to their office with pay stubs so they can arrange for child support payments.
My question is do i have to pay child support before having a custody hearing?
Should i give them my paystubs and info or just tell them custody has not be determined yet?

I would comply with CSE, but keep them informed about your upcoming custody trial. Keep in mind, also, that after the judge makes a ruling on custody, you may have to make up for past child support payments if you have not provided the mother with support thus far.