One of the main causes of painful scrotal swelling is testicular torsion. This is an injury or an event that causes a testicle in the scrotal sac to twist and cut off blood circulation. This very painful injury could cause tissue death to the scrotum in a matter of hours. Medical conditions and diseases can also cause the scrotum to swell.
As said, credit and debit cards (cartes bancaires or cartes bleus) are widely used in France. This is also practical as automatic payments are common in France for things like train/metro tickets, parking, motorway tolls, etc.
Unlike the English-speaking countries, France has a dual legal system; one branch, known as Droit public, or Public law, defines the principles of operation of the state and public bodies. This law is applied generally through public law courts, known as les Tribunaux administratifs.