Error Message 10002: Security header is not valid

[jennylcr]

I'm trying to make transactions by using a paypal pro account, however, it keeps giving me the same error. I have the credentials checked several times, the code is working for other paypal accounts, but no luck on this one. If someone can take a look, that would be helpful.

Here is the response message:

{"TIMESTAMP":"2018-02-28T22:07:53Z","CORRELATIONID":"b2ef63f12871a","ACK":"Failure","VERSION":"119.0","BUILD":"39949200","L_ERRORCODE0":"10002","L_SHORTMESSAGE0":"Security error","L_LONGMESSAGE0":"Security header is not valid","L_SEVERITYCODE0":"Error"}

[MTS_Ciaran]

Are you testing on sandbox or live, the API call above was made on the Live API endpoint, so the account API details need to be for a live account. If youre using a sandbox account it will return this error. 

[jennylcr]

I'm testing in the live environment. By the way, i tried test endpoint as well, it's giving me the same error.

[MTS_Ciaran]

thanks, are you passing the "subject" variable in the API call, I checked the logs again and I can see a blank subject "&subject=" can you try removing that from the API call and trying again

[jennylcr]

I have the subject removed from the header, it's giving me the same error,

here is the response message from my last test,

{"TIMESTAMP":"2018-03-02T13:46:10Z","CORRELATIONID":"c4e83cd2505bf","ACK":"Failure","VERSION":"119.0","BUILD":"39949200","L_ERRORCODE0":"10002","L_SHORTMESSAGE0":"Security error","L_LONGMESSAGE0":"Security header is not valid","L_SEVERITYCODE0":"Error"}

my api call is working for other paypal pro users, but not this one, is there anything we can check in the account settings?

[Kfer]

Read this:

 You need to exit Sandbox testing and select a Live-Prodution option