Yes you can, upon registration you can select NO to auto-renewals and proceed with your payment.
Please note that:
- Your account won't be automatically renewed after 30 days and your service will fall into Grace period.
- You would then have to make a manual payment (HQ > click on 'activate base plan' > redirected to Maxis Pay to pay) to reactivate your service.
- In the future, you will not be able to set up auto-renewal for your account if you decide to go with this option.