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PayPal Sandbox testing of IPN Listener always returns INVALID

Contributor

PayPal Sandbox testing of IPN Listener always returns INVALID

I am working on a custom payment system for my blog (PHP), and now I am trying to implement the IPN system.

 

I have fully copied the PayPal php example, but no matter what I do, I always get an INVALID response when validating the IPN request.

 

I have read tons of other topics explaining the same problem and still can't find a solution.

 

- I am using the OFFICIAL code example

- I am using the sandbox IPN address

- I have tried with and without setting a value in 'payment_date' , because many others suggested that the problem is in the plus sign inside the date.

- Tried with and without https:// at my end

- I have tested the code on 2 different servers, from 2 different PayPal developer accounts.

 

And each and every time the response of the validation is INVALID.

I am almost ready to give up...

 

Thanks in advance!

2 REPLIES
Contributor

Re: PayPal Sandbox testing of IPN Listener always returns INVALID

There are currently 4 topics with no reply in this section, all about this specific problem.

At least some of your tech team, can step up and confirm the problem?

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New Community Member

Re: PayPal Sandbox testing of IPN Listener always returns INVALID

I've even emailed myself the message sent by Paypal and my return message to verify myself that the message is the exact same. I get a green light from the IPN Simulator but the response is always INVALID.