[PayPal Mobile] I'm getting error when using a Paypal sandbox config

[PayPal Mobile] I'm getting error when using a Paypal sandbox config

  
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(5)
Published on 2017-04-04 by Nuno Lopes
5 votes
Published on 2017-04-04 by Nuno Lopes

Hi, I would like to test this paypal mobile in Sandbox. What are the items required to have successful posting of payment in sandbox. 

I'm getting error when using EnvironmentId = Sandbox. I have already put the correct clientId and client secret.