Why won't my theme update on the checkout page in development environment?

[iO-Rotterdam]

We have a headless website, but for the checkout we link to the myshopify checkout page. We have a theme in our production environment and that works fine. If we edit the code in the editor, we see this change in the checkout. For our development environment (different Shopify environment) we added the exact same theme, but it doesn't update. Even if we add any other theme it still has the same code in the frontend. It seems like it just renders a default theme on the checkout page.

Does anyone know what the problem could be?

[ExpertRookie]

Hi @iO-Rotterdam ,

Not sure, but I guess you are mentioning on customizing the check out page. According to Shopify "The checkout.liquid layout is available to Shopify Plus merchants only.",. For more details, have a lookt at this help

https://shopify.dev/themes/architecture/layouts/checkout-liquid

[iO-Rotterdam]

Unfortunately that doesn't seem to be the problem. We do have Shopify Plus on both environments

Edit: I am indeed talking about customising the checkout page