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Where to Buy an A1 Certificate The certificate A1 is a reference to the social security system in place to an individual who is seconded abroad to work. This is a crucial document, and failure to adhere can be a serious issue. A Belgian inspection launched criminal proceedings against a Slovak company that had posted workers without the A1 certifications required. A1 certificates are binding on the institutions and courts of the latter Member States. What is an A1 Certificate? The A1 certificate is a vital document for business travelers who travel thro