Plenty of installment selling in Rwanda still runs on trust and a note in a book. That works until it does not, and the moment it fails you discover that a note in a book proves very little about who agreed to what.

You do not need a legal department. You need four things recorded properly.

Step 1: Establish who the customer is

Identity is the foundation. Everything downstream depends on it being right.
What to capture: National ID, a phone number you have actually called, and a physical address someone has confirmed. An agreement with an unverified party is difficult to enforce and easy to dispute.

Step 2: Write the terms before money changes hands

The terms must exist in full before the goods leave the shop.

• Must be written: Total amount, installment size, due dates, penalties, and what happens on default.

• Must be understood: Read the escalation clause aloud with the customer. A term the customer genuinely understood at signing is far more likely to be honoured, and far harder to contest later.

Step 3: Have it verified

A licensed notary confirms that both parties are who they claim to be and that each understood what they signed. This is the step that converts a private arrangement into a document with legal weight , and it is the step most often skipped, precisely because it used to mean a trip across town with a folder of paper.

Step 4: Keep the trail

Store the signed agreement, the verification record, and every payment against it in one place.

• Record payments as they happen, not from memory at month end.

• Keep the reminder and escalation history attached to the agreement itself.

• If a dispute ever reaches a third party, the complete trail is what decides it. Assembling that trail after the fact is usually impossible; capturing it as you go costs almost nothing.