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Find bpost partner ID
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Bpost for business
First, you need a business account on bpost. This will give you a bpost Partner ID.
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Find your Partner ID
Log in to your bpost business account
Click on your account name at the top of the web application
Go to 'My accounts' on the side navigation on the left of your screen
Find the account for the company in the list you see under My accounts. You will need the 'Account No.' ('123456' in the example)