Hello,
I'm not an expert in Malaysia e-invoicing, but it appears you can only set one set of credentials for your SasS API calls.
The official documentation requires entering your Client ID and Client Secret from the Inland Revenue Board of Malaysia as out-of-the-boxe.
If you opt for a Middleware, check whether:
You can update the setup with the Middleware’s credentials;
The Middleware will handle sending the e-Invoice to the authority
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