How do I opt-in and out for this substitution service? December 27, 2023 02:23 Updated You may switch your preferences at the checkout/account page. Click here to switch your preferences. Here’s how to opt in for Substitution Via Checkout Via Account Related articles I only knew about the substitution option after check out. Can I still opt in for substitution? What is Substitution, and the items available for substitution? Why can't I find the option to opt-in for item substitution? I'm not satisfied with the substituted item, can I request a refund/exchange? How do I order FairPrice E-Vouchers on behalf of my company?