ONLINE Quarterly Student Enrollment/Assessment Certifications (April through June 2018) DUE July 15, 2018. You may access our website at highered.colorado.gov/dpos/payments and follow the posted link and instructions to pay by credit card or e-check. Please note: there is an administrative portal fee for using the online options. E-check adds an additional $1.00 flat fee and using a credit card adds a $.75 flat fee plus 2.25%. Portal fees will be disclosed in advance of check out.