You should liaise directly with your carriers if you believe that you will be unable to provide the information they require. The carrier can advise on the impact on movements between GB and NI and may recommend how best to mitigate that impact.
If you are shipping B2B, you should liaise with your carrier to understand whether they can support these shipments. Where they do, you will need to confirm any additional shipping requirements and if B2B shipping is supported on all carrier services you plan to use.
Please speak to your Metapack Account Representative as soon as possible.
Alternatively, please raise a Change Request into the Metapack Customer Portal, specifying the carriers/carrier services to be introduced.