I have found the answer in the meantime:
besides following the steps in the blog (https://community.shopify.com/topic/614939) , you also need to add the following code to the theme.liquid file before the tag.
Topic summary
Terms and Conditions checkbox on the Shopify cart wasn’t blocking checkout (Refresh theme). The original poster fixed it by, in addition to the community guide steps, adding jQuery 2.2.4 to theme.liquid before :
Additional inputs:
- A thank-you confirmed the fix helped others.
- A question asked if this works on the Dawn theme; user reports a popup requiring acceptance appears but no checkbox renders (no solution provided).
- A video tutorial was shared for adding a checkbox without apps.
- App options suggested: a Shopify Plus checkout app (adds checkbox at checkout) and a free cart checkbox app (screenshots attached).
Unresolved/ongoing:
- Dawn theme case with missing checkbox despite popup remains unanswered.
- A French user noted that with PayPal payments, customers aren’t prompted to accept terms and asked how to enforce it. No resolution yet.
Notes: jQuery (a JavaScript library) is required for the referenced code; Shopify Plus is the enterprise plan allowing checkout customization.
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