Whatever you do, don't take ease of programming your solution as a valid way to look at the problem. You are talking about a cart checkout process. The payoff to your client's entire business model. Paramount is making something that will not step on its own you-know-what ... ever. As in fault tolerant. I'd cross session vars clean off the consideration list since they can go byebye for a variety of common causes. In my mind, we are talking about database or client vars. Only. Pick the solution that survives the most number of common, imperfect circumstances.
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