Due to a specification change by Shopify, the number of checkout rules that can be enabled across an entire store is now limited to a maximum of 25. In response, our service's specifications will change as follows.
This change is based on Shopify's system limitations. We apologize for any inconvenience and appreciate your understanding and cooperation.
Reference: About Server Errors Caused by Shopify Specification Changes
[New Restriction Details]
Number of checkout rules that can be enabled: Up to 25 total across the following rules
- The number of pre-order rules using the "Robust Restriction on the Checkout Page" feature
- Restrictions on simultaneous orders using the checkout page on the Order Limits page (this also counts as one)
- The number of rules from apps other than RuffRuff 予約販売 that use the Cart and Checkout Validation API (※)
※ Please note that other apps may not use the term "rule."
[When the Restriction Limit Is Exceeded]

An alert message like the one above will be displayed.
If the alert message appears, please review your rules—for example, by disabling any unused rules among those listed above.