We have specific requirement list for recurring payment method which are as follow:
I know there are two options (subscription and recurring payment) but i am confuse which is suitable for this scenario. If there is another solution available then please suggest it.
PayPal doesn't have a coupon code feature so that is something you would need to handle on your own.
You can set up a trial period for a Recurring Profile that lasts a month and would be charged at the lower rate. After that trial period the Recurring Profile would start billing the normal amount of $7.
A buyer will always be able to change their Recurring Profiles within PayPal. You can't have a Recurring Profile open with PayPal for free. We require that a positive amount is provided. You can still track the users on your own but there wouldn't be an active Profile for them within PayPal you can check.
An existing Recurring Profile can be updated but the amount charged cannot be changed more than 20%.
Either a Subscription button through Payments Standard or Recurring Payment API's through Express Checkout will allow you to do this. Express Checkout Recurring Payments can be handled entirely through API calls.