The necessity to consume APIs directly depends on your role within the e-Invoicing ecosystem.
If you are a taxpayer who has employed a System Integrator (SI), you will not need to consume APIs directly. Your SI will handle this on your behalf.
However, if you are a taxpayer with the internal capacity to act as your own System Integrator, you will need to consume all APIs under System Integration on the API documentation page.
This is because compliance with invoice creation standards is a primary requirement for all taxpayers which can be self-implemented or through the service of a third party (SI).
