Every plan issues a license key, API key and secret key the moment your payment clears — use them to unlock the install.php of any module you're entitled to.
One run of a module's install.php against one domain. Your license lets you activate up to its install limit; deactivate an old install anytime from your dashboard to free up a slot.
Yes — upgrade to a bundle at any time from your customer dashboard and your license's module list is updated immediately.
Razorpay (cards, UPI, netbanking) and PayPal, configured by the platform administrator.
Yes — every module is plain, unencoded PHP you host yourself. The license simply authorizes the install.