Hello, 

The link isn't activated as yet for APICET Counseling fee payment. 

Till then, you have to keep checking the official website mentioned below - 

https://sche.ap.gov.in/ICET/ICET/ICET_HomePage.aspx

When the link is activated you just need to follow these procedure-

As you visit the link,  click on processing fee payment online

Enter APICET Hall Ticket number and rank and click on pay fee online

The candidate will be directed to payment gateway

Select any one mode of payment and enter credentials(for general it is Rs 1200 and SC /ST it's 600)

Upon successful payment, click on tab ‘print’ and take a print copy to produce it at the time of verification of certificates

Hope, this helps.