Third-party platforms are designed so buyers can easily compare, so you basically present the same set of terms to all visitors. The differentiation space you have is very limited. If you want to set different price tiers, MOQ thresholds, payment terms for different buyers, or even decide which buyers can see which products, you need a system you control. The practical approach is: configure each buyer's quotation terms, price tiers, and payment methods in advance, then automatically pull them in when opening an order—no need to adjust manually each time or risk quoting the wrong price. For visitors without an established connection, you can maintain a separate public page showing the product information you're willing to disclose, serving as your external face. These two layers of logic are separate and can coexist.