Hello, If I am having paypal business account & have set primary currency to GBP. In the php form i have set currency_code to "USD". Somehow getting "payment_gross" value empty. May be if user make payment by currency other than USD than "payment_gross" value in IPN response is empty. However there is value in "mc_gross" variable in IPN response. So the query is can i replace "payment_gross" with "mc_gross". It is ok & safe as i am not sure if there will be negative value in mc_gross. Will mc_gross work for USD as will as other currency ? Also i need link to latest pdf guide for paypal API Integration (PHP). Please guide as i m new to paypal. Thanx.
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