you may fee during the time of registration or they may send you notification but my suggestion is you that do not take any kind of risk and conform to the office you may get you a solution. you may contract or ask by E-mail they definitely help you and provided solution and answer to you.

Good luck.

Dear aspirant, 

The online payment of fee has started, now you can pay the fee for your apicet counselling 2019 on the official website of apicet through net banking, debit card etc. I'm providing you the link of website where you have to pay the fee for your certificate verification. Below is the link. 

https://apicet.nic.in/payFeeOnline.aspx

GOOD LUCK.