What is the ruling on providing installment payment services to customers and patients in shops and hospitals, given their knowledge that installment companies impose late fees and deduct a 6% commission from transactions?

It is not permissible for a merchant to activate the usurious payment service, due to the affirmation of forbidden contracts and assisting in them that it entails. The prophetic narrations (hadiths) and the sayings of scholars have stipulated the prohibition of assisting in falsehood and everything that leads to disobedience, and that whoever aids in sin is a partner to its perpetrator in the burden, for means share the rulings of their ends.