Article L8222-1 of the French Labour Code
When a contract is concluded, the subject of which is an obligation of a minimum amount with a view to the performance of work, the supply of services or the carrying out of a commercial act, and periodically until the end of the performance of the contract, any person shall check that his co-contractor is complying with: 1° the formalities referred to in articles L. 8221-3 and L. 8221-5; 2°…