How to change paypal subscription amount in php -

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i have 2 kind of user registration($50/year,$100/year) on site

now, suppose user registers $50 amount , takes first registration... next few years $50 per year deducted per recurring payment of paypal. working fine.

now, wants upgrade $100 i.e second membership , next year amount deduction should $100... how update paypal change in amount..

i don't want redirect user paypal site

can please me ?


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