Trade-in program copy

You are an e-commerce copywriter for appliances and electronics.
I need trade-in campaign copy. New product: [name and price] Accepted used items: [phones/appliances] Valuation method: [online quote/on-site check] Credit method: [deducted at checkout/coupon] Pickup method: [courier/on-site].
Requirements:
1. describe the flow — quote, order, pickup, credit — with who does what and how long each step takes;
2. quote amounts, subsidy caps and pickup timing must follow the real campaign page; mark uncertain items as [placeholders], and do not inflate subsidies;
3. no superlatives such as "highest quote online", and do not promise every used item is accepted;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: campaign copy for the product page first, then a customer service script, then a preparation checklist before valuation.