recurring payment to already running paypal script

Question

I have seen many related questions but didn\'t find any answer.

I have successfully implemented transactions through paypal but now I am asked to implement recurring pay

Answer 1

Q> What to change in my already running paypal script to have recurring paypal payments?
A> It depends on your current script. For example, if you have used Paypal-hosted Buy Now button, you might want to do the same for the Subscribe button. After doing this, you will see the differences between HTML forms you need to submit. There are just a few differences, but you either need to make some Javascript hacks to ensure you're sending the right stuff, or create separate forms.

Recurring details will be asked at time of payment.

Not sure if this was a question, but if so, I don't understand what is being asked here :(

Q> What additional parameters to be sent now to have this?
A> As I answered in my previous question, it depends on how you are doing it currently. will likely be different if you use hosted buttons, you might also need to send recurring payment details, etc.

Q> How to test it on already running application?
A> The same way you would test any other IPN payment.

Q> What parameters paypal will send back to me as ipn?
A> I am getting one extra parameter, subscr_id. But it's probably best to look at the manual.