Paypal recurring payments stopping

I am using recurring payments in Paypal. And successfully implemented.

Now if the user choose another package, I need to start a new recurring and stop current rec开发者_如何学编程urring.

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You should send modify = 2, parameter with form where you are allowing user to modify plan.

Go to following link and search modify

https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_html_Appx_websitestandard_htmlvariables