Upon successful registration, business is automatically activated on a FREE 30 days trial plan. The Quick Tasks menu updates you with the number of days left in your free plan and there itself a link is provided for you to upgrade to a paid plan as per your business requirements.
To view/change the plan, head over to Business Settings. Under Manage Subscription, there is a tab- Subscription Settings. You can view your current plan details here.
You can upgrade your subscription by clicking on Change Plan. Upon doing so, you will be redirected to the pricing page to buy a suitable plan. For each subscription plan you will see a Buy Now button below the plan.
Upon clicking on Buy Now, you will be redirected to a payment page. You can buy a subscription plan using a credit card, debit card, net banking, and Xpress Account (provided there is a sufficient balance in Xpress Account). You can either use saved cards or use a new credit/debit card to make payment. You have an option to save that card for future use to make subscription payments. If you are upgrading from a free plan, then Xpress Account payment mode will not be available.
Upon successful payment, your respective subscription plan will be activated. Screenshot of a successful transaction is given below: