You cannot accept your offer and pay at a later date. A Confirmation of Enrolment (CoE) will only be issued after your first payment (as listed on your offer letter or on the online acceptance portal) is made. You will only be able to enrol in your course after first payment is made.

You are advised to make your first payment as early as possible to allow sufficient time, as you are required to submit your CoE to apply for your student visa.