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 USPS Incorrect Username/Password?
Author    Topic »  

mafluet
New Member

USA
78 Posts

Posted - 01/22/2026 :  08:49:02  
Hi,

I followed the instructions for the app creation portion, creating one and copying the consumer key and secret key and pasting them into the correct fields. After doing so, attempting to get rates on the site leads to an "Authorization Error: Potentially Incorrect Username/Password" error on the estimation page and shipping choice page. I clicked the copy symbol on the USPS page and pasted them accordingly, they're both very long keys as expected.

I am on version 7.8.8, will update to 7.8.9 just in case of any issues with that.

Could there be some type of error I could be making?

Edited by - mafluet on 01/22/2026 10:43:59

mafluet
New Member

USA
78 Posts

Posted - 01/22/2026 :  10:31:50  
I can confirm that post update, I still have issues with USPS on my site. I've reverted back to the old method for the time being, but don't understand why this is happening if I am copying and pasting the keys into their exact specified boxes in Shipping Admin.

Vince
Administrator

43249 Posts

Posted - 01/22/2026 :  10:58:49  
Is it possible you are using the $pathtocurl parameter in your includes.php file?

Vince

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mafluet
New Member

USA
78 Posts

Posted - 01/22/2026 :  11:03:51  
Just checked now, I do not see that line anywhere.

Thanks,
Mike

mafluet
New Member

USA
78 Posts

Posted - 01/22/2026 :  11:38:05  
For context, we are currently using the old USPS integration method, and I've tried applying the new oAuth method with the Consumer and Secret keys, but have led to this error after testing USPS shipping rates. I also did not setup the EPS account payment method, but it doesn't look necessary to do so if my app has been approved already.

Edited by - mafluet on 01/22/2026 13:02:46

Vince
Administrator

43249 Posts

Posted - 01/22/2026 :  13:11:35  
Hi Mike
Could you send the Consumer / Secret keys to my email (vince AT ecommercetemplates DOT com) and I'll try here.

Vince

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