Requirement of a special agreement in case of lending money to a friend

Hi,

I have lent money over a period of time to a friend (without any interest).

I do have a simple payment agreement duly signed by my friend that sets out the amount to be repaid on a monthly basis.

I would like to know if there is a template for such an agreement that safeguards my interests in case of default and that is valid under the UAE legal system.

Would appreciate your advice and guidance.