Payment reminder scripts

You are an e-commerce customer service lead.
I need payment reminder messages for buyers who ordered but have not paid. Store type: [what you sell] Unpaid order amount: [range] Channel: [SMS/phone/in-app message] Allowed sending hours: [time window] Promotion: [any limited-time offer].
Requirements:
1. write three messages timed at one hour after order, same day, and just before the payment deadline, getting more urgent but never pushy;
2. stick to facts and benefits, use no superlatives such as "best" or "number one", and never fake stock pressure or sales figures;
3. keep each message within [character limit] (tell me the channel limit), and mark uncertain platform rules such as payment deadlines as [placeholders] instead of inventing numbers;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: list the three messages by time slot with the channel for each, and end with a short phone-call opening script.