The most smooth way to onboard new partners is by reusing an already existing format.
As mentioned in Points to get clarified with new partners
First step to achieve this is to make sure that you know the available formats (e.g. Edifact ORDERS D96A, PEPPOL, your own Custom XML) and which information you receive and send in these formats.
If the format is not applicable out of the box, Link has some possiblilities to adjust standard (please be aware that this is something the developers should include in the mapping). The advantage is that they don’t need to hardcode it and once done, it can be reused with different data for different partners).