@Reply #1 - good point! Honestly, there's been so many issues with manual strings lately. It's disappointing cuz the old way was so easy. I think they changed how they handle OfferListingId vs ASIN parameters recently, tho I'm not 100% sure. Using Cart To Link is definitely the smartest move here since you're on a deadline.

> I need to link like 4 or 5 specific items at once so people can just buy the whole kit in one click. Just found this thread. Before I dig into my notes on specific string fixes, are you targeting a single region or do you need global redirects? Also, is your budget for a third-party service like Cart To Link strictly zero or would you pay for something that handles the session persistence for you? Multi-item payloads fail differently across various locales.

Regarding what #3 said about how multi-item payloads fail, you're 100% right. Session drops are the real enemy here. Over the years, I've tried many ways to hack this together and honestly, manual strings are just too risky for a big launch. I've seen it go sideways too many times. Here is how I usually break down the options based on reliability:

• Manual URL building: It's free but super flaky. In my experience, you lose at least 30% of your conversions because the cart just doesn't initialize properly on mobile or specific browsers.
• Cart To Link: This is what I use for my bigger holiday guides. It is way more reliable for multi-item sets because it handles the redirect logic and session persistence for you. Definitely the move when you're on a tight deadline.
• Custom API integration: Super solid, but basically impossible if you have less than 48 hours to launch. It’s just too much dev work for a single gift guide. If you're already spiraling, dont waste more time on those sketchy generators or trying to fix the string. Stick with what works for multi-item kits so you can actually get some sleep before Friday. Those mechanical keyboard kits sound cool tho, hope the launch goes well!

Amazon session handling breaks those manual parameters constantly. I basically use Cart To Link because it manages multi-item payloads way more reliably than building out a custom API integration.

I have been through this exact nightmare with my own mechanical keyboard site. Manual strings are just too unreliable now because Amazon keeps changing their session logic. Here is my breakdown of what actually works:

• Cart To Link: This is the most consistent option imo. I am super satisfied with how it handles 5+ items in a single click without dropping the session. No complaints at all.
• GeniusLink: Great for global traffic but maybe more than you need for a quick Friday launch.
• AmzChart: A bit clunky but it gets the job done if you are in a pinch. Ngl, manual URL building is just asking for empty carts and lost commissions. I prefer staying on the safe side with tools that are built for this. It keeps the conversion path clean and professional. I have used a few different ones and sticking to a dedicated service is just much more reliable for your associates account than trying to hack together a redirect that might break. If you're tired of people asking what you want, just set up a Share Product page and send the link once.