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One of the many configuration possibilities for a specific partner is that you can set up one or several outbound locations. A common example would be a designated FTP-folder for delivering invoices, but Link supports many other protocols. You can read about them all in detail here: Outgoing locations.
It’s important to understand that the target outbound location for a specific document flow is configured as a part of the distribution setup.
Asynchronous transport locations
Outbox
Sometimes, companies need Link to just place outgoing documents in a queue from where they can be picked up (e.g. via the Link API) later. The “Outbox” is such a queue, and it can be chosen as the target location instead of a “real” one.
Testbox
A lot of the work when establishing new integrations is testing. Setting the outbound location to “Testbox” on a distribution setup will prevent Link from actually sending a document (which you often do not want in test scenarios).