Creating Buy Now Button with Variable amount

[sheherezade]

I reviewed the Feb 03 2011 post on this topic and was successful creating a button with variable amount, but the payment generates a verification error (Error:  Payment was not correct (amount/currency) )

How can I avoid this verification error?  Do I have to change the IPN listener to ignore the issue?

Thanks--

[MTS_MichaelL]

Sheherezade,

The error you quoted does not sound like any PayPal checkout error; I suspect it's being thrown by a store or other third party software. It is possible that the payment amount is being somehow verified before being submitted and it fails if mismatch is detected. If you give me steps to reproduce the error I may be able to tell you more.

The general rule is: to make the amount dynamic, use a non-hosted button and either leave amount blank (buyer will need to enter it at checkout) or prepopulate dynamically before forwarding to PayPal.

IPN listener shouldn't have anything to do with accepting such payment. Although a script may be configured to refuse a notification with mismatching details, the payment has already been completed at this stage.

Regards,

Michael

MTS

[sheherezade · Accepted solution]

It turned out to be an issue with payment verification code (the code did not allow for a zero amount button).  With a zero-amount (variable payment) button, the code that verifies the transaction needs to take this into consideration and not try to validate the amount, since it could be anything greater than zero.

Thanks for your reply-- I wasn't sure where this was being generated.

Sheherezade