The globalization of the economy and the development of international trade and the international economy have greatly increased the international movement of individuals across regions. The existence of different regimes in different countries often plays an important role in the free cross-border movement of workers or self-employed workers. As part of the cancellation or abolition of the double contribution, workers who have access to employment in an SSA country are exempted from the provision of social security contributions in the host country for a given period (specific to each SSA), provided that they continue to pay social security contributions in their country of origin. This benefit can be requested by applying to the social security authorities of the country of origin for a certificate of coverage (CoC) and submitting it to the social security authorities of the host country. .