Hi Jergens,
1. Send acknowledgement email to your VO email id about your payment.. instructions mentioned in the email itself.
just for your reference pasting the instructions
You may pay your RPRF online. Instructions on how to pay your fees can be found at: https://eservices.cic.gc.ca/epay/welcome.do?lang=en. Once you have completed your online payment, please retain a copy of the receipt and forward the confirmation of payment to the following e-mail address: Colombo-im-enquiry @ international.gc.ca. The e-mail to our office must include the following information:
Subject line: Payment for [insert your immigration file number]
Body: Given/family names and date of birth of the principal applicant."
2.You have to fill details like applicant's DOB, UCI number in the printout. You should attach it with all the docs like Medical receipts, Ack from hospital, PCC, etc.. and send it physically to your VO. Address must be mentioned in the email itself.