Demand letters — written, sent, and provable

Who owes whom, the contract behind the debt, the outstanding amount and overdue periods, any penalty interest, a deadline to pay, and what happens if it passes. Flows fills those from the contract record onto your template, so the letter's numbers match your books exactly.

A reminder is a courtesy nudge; a formal demand letter — often called a notice (โนติส) or หนังสือบอกกล่าวทวงถาม — is a documented legal step that typically precedes a lawsuit. In Flows both are milestones: reminders log as messages, letters generate as documents with delivery proof.

Yes — letters generate from your templates, configured into Flows by the Yangshu team. Many companies keep two: a firm first letter and a final notice reviewed by their lawyer.

You record the EMS tracking number with the letter; the delivery status and date are logged on the milestone timeline, and any signed acknowledgment can be attached. The letter and its proof stay together on the contract.

That's a business and legal judgment — common practice escalates from calls and written reminders to a formal letter once promises are broken. Whatever your policy, Flows makes the timing visible: the timeline shows exactly what has already been tried and when.

If the contract accrues penalty interest, the letter can state the accrued amount as of the letter date — computed by the system, not estimated. See the penalty-interest feature for how accrual works.