Is Lat and Long mandatory for "POST tour" API call

I am exploring the possibilities of integrating RouteXL into our e-Commerce platform for delivery planning. From the API documentation, ?I could ?understand the “tour” API needs address and Lat&Long. Is it mandatory to pass Lat&Long during the API call or is it an optional parameter

The lat,lng coordinates are very much required, as the API has no geocoding. You’ll need to geocode addresses to coordinates. These coordinates are used when routing.

The address is only used for your reference in the results. It is required but does not need to be a full address, e.g. an index number should work too.

Thanks for the clarification