Create better Exceptioninfo ;)

[thejoe8495]

erpnext-shipping/erpnext_shipping/erpnext_shipping/doctype/letmeship/letmeship.py

Line 64 in 0901962

url=url, auth=(self.api_id, self.api_password), headers=headers, data=json.dumps(payload)

The error messageblock shows only error, it would be better to return the complete JSON from the server.
In our case the return was an undocumented:
{
"errorCode": 400,
"errorMessage": "Your request is not properly formatted, please refer to the documentation guide for sample requests"
}
The created JSON is valid but Letmeship don't want to accept it. We can reproduce it in the swagger ui of Letmeship and create an Ticket on Letmeship to find out where is the Problem n the JSON.
https://api.letmeship.com/v1/swagger-ui.html#/Available%20Services/getAvailableServicesUsingPOST

[barredterra]

I didn't check, but you should probably find the complete error in the Error Log DocType.

Btw, I did test the available services with LetMeShip and it should work fine in the latest release.