Are you receiving a "ForbiddenRequestException - No access to module: api_standard" error message?
There are 2 reasons for this error message.
1. The API is not activated, in that case go to “Apps and extensions” under the settings tab, and make sure that the API is activated.
or
2. A default company is set, that might cause you to login without a valid eAccounting license.
Check again what company you are logging into and make sure it is not set to "Default" if it is, then we have an articles on how to change that, Default company-article.
If you have several companies available in eAccounting, you will be able to select which company to Authorize for the Auth endpoint.
The list of companies is available from a dropdown menu in eAccounting after logging in.
If this menu is missing, the Default company setting might be turned on.
After logging in to eAccounting, go to the menu in the top right corner.
Press "Choose default company"
press the blue star (the default company) to remove it as default. And save!
For more information regarding error messages when authenticating, see HERE
For more information regarding error messages from the API server, see HERE
When you receive an error code in the API, you should also find a message in the HTTP response.
This will inform you as to the general error that has occurred.
When debugging the API request, we recommend using Fiddler.
If you need to contact support, please attach both the HTTP request and the response retrieved from Fiddler.