Royal Mail Real-Time Rates Limitations
There are no API endpoints provided from Royal Mail side, therefore Real-Time rates cannot be requested on the fly.
For that reason we have worked on creating Table Rates methods equivalent to the rates Royal Mail provides generally.
This can be used as a workaround to cover the real-time rates depending on the product weight and size:
We are ready to provide you with a package of pre-configured methods to imitate real-time rates from Royal Mail.