paypal sandbox ipn return url not being called

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Hello, I am PHP developer and working this field more than three years.I have good knowledge of Paypal API.I can return URL from your Paypal sandbox account for given your time of period. Thanks.

Greetings this should be a quick fix - probably a hour. I am ready to do it right now. Thank you. :)

Hello I think i just have to set the paypal return url right? if yes then please come on chat for discussion. Thanks with Regards Nilanjan

Hey, I know very well how to fix issue, I have prior competed such jobs in freelancer also. I hope $4 want huge for you!!!! Let me know ASAP. Thanks Andrew

Dear Sir/Madam, I am highly skilled in the area not to mention I myself had that problem. I would like to participate in the project and I think I will complete it within 3-4 hours. Thank you, Regards.