i already paid for my parent's biometric fee along with the application/service fee. now would i just wait for the request letter from ircc or after i submit the application along with the receipt?You cannot do biometric without a biometric request letter from IRCC. There is a barcode on that biometric letter for you to submit to service canada to complete your biometric. From the biometric letter, there will be instruction for you to follow and what documents to bring on the day of your appointment.