Is there a subscription, and how do I cancel a monthly plan?

Post packs are one-time purchases, so there is nothing to renew or cancel. A monthly plan is a subscription, but it never charges you automatically: before each 30-day period ends you get an invoice and pay it yourself by UPI.

To cancel a monthly plan, contact support. When a plan is cancelled:

• you keep the posts you already received — they stay in your balance and never expire;
• no further renewal invoice is issued.

If you simply don't pay a renewal invoice, the plan ends on its own after a short grace period and the unpaid invoice is cancelled, so no old bill stays open. Either way you can keep using your remaining credits, and buy one-time post packs whenever you need more.