It's a Square issue, not Meta. Meta is orders of magnitude larger than Square. They do not adjust their integration parameters based upon what Square needs.
Currently, square does not properly integrate with Meta because it cannot have variables passed into a direct url for the checkout or cart ("dynamic cart injection," apparently).
Square's competitors - the people who's market Square is trying to get a piece of as they grow into the e-commerce market - do accept dynamic cart injection.
Therefore, your advertisement that you integrate with Facebook/Meta shops is not exactly true any more. Your customers can show their shops but cannot sell.
Meta's method of passing information to an external cart may not line up with Square's current system but they absolutely will not adjust their functioning to fit Square's. It is a Square issue... they need to comply with the needs of the market; not the other way around.
And until they do that (and improve their help system (see Big Commerce... WORLDS better support than square)), they simply will not get the share of the e-commerce market that they hope to get. Their in-store products are great. Their software and onboarding teams are made quite well. But their support and willingness to adjust structures like this are sorely lacking. It kills what is otherwise a pretty great product.
I'm pretty sad that I didn't switch to Shopify at this point. It's unfortunate because everything else is so good.
