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One of the most important tasks when creating a new partner is to get the identification mechanism right. In many cases, you will have an endpoint that receives documents coming from lots of different partners, and in thiese these scenarios, Link will determine the sender partner via the content of the document. As you probably know already, there are many different standards for identifying a business partner (e.g. GLN, DUNS, VAT etc.) - these are called "Identification types" in Link, and it is important to get your partner identification correctly configured - otherwise you risk that Link will be unable to determine who sent the documents.
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You will then be shown a data grid showing all available identification types (the screenshow figure below does not show all).
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Link can use a regular expression when identifying the partner based on document content. This is an advanced feature that is described further in the Link Technical Guide /wiki/spaces/L300/pages/2478806904.