Dear Leela,
Please find our response below:
Are there any validations associated with the LGA field? Yes, please reference the endpoint provided. https://einvoice.firs.gov.ng/docs/resources/lgas_
Will the "City" in Address and "LGA" corelation will be validated? Yes. Can we select any LGA with respective of state? No, it has to correspond
Is it possible to get the list of areas corresponding to each state or LGA from the system or API? We advise you to speak with your system integrators. They are responsible for providing this secondary API