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You can request a PostNL Test (Sandbox) API Key via https://developer.postnl.nl the required API's are:

Shipping
Labelling
Shipping
Location

With this key you will need to create a few test labels, to make sure everything works.

When you are done testing, you can get a Production API via the PostNL CIT Service Desk.

The telephone number of the CIT Service Desk is: +31 (0)88 225 56 51
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