Block checkout based on conditions

How to use:

Step 1: Turn on the Blockify checkout rule. Please review this guideline to learn how to enable it. If you've already enabled it, you can skip this step.

Step 2: Go to Block Checkout tab >> Click "Create rule".

Step 3: Set the Rule status. Selecting Enable means the rule will be active right after creation. Selecting Disable means the rule will not be active. (To set the rule status to Disable, click the Disable button.)

Step 4: Choose a condition under Select condition. The following options are available:

• Email
• Phone number
• Name
• Country
• Address
• Zip code
• Customer tag

Step 5: Enter the information to be blocked into the input fields >> Click button "Save" to create rule

Note about Customer tag: This rule only applies to visitors who are already in your store's customer list. A first-time visitor (email not yet in your customer list) has no tag, so they won't be blocked by a Customer tag rule.

Customize the error message (New)

Under the THEN block, you can now customize the message shown to customers when this rule blocks a checkout. Different rules can have different messages, giving you more flexibility over how blocked customers are informed.

Available options:

• Quick preset — pick a ready-made message or select Write custom to write your own.
• Icon — turn on to show a warning icon next to the message.
• Message text — the custom message shown to the customer at checkout. Up to 255 characters. Uses Shopify's default checkout validation styling.
• Append fake error code — turn on to add an error code to the message.
• Position — choose where the error message appears in the checkout flow (e.g., Top of the checkout page).

Use the Preview panel on the right to see how your message will appear to customers before saving.

Once set up correctly, orders that meet the configured conditions will not be created. Instead, the checkout page will display a warning: "Order cannot be placed due to suspected fraud."

Note: Checkout Validation Limit Notification

We have added a notification to help you monitor checkout validation usage and prevent rules from stopping due to Shopify's validation limit.
Status indicators:
🟢 Green — Usage is within a safe range. All rules work normally and you can continue creating new rules.
🟡 Amber — Approaching the limit. Review or remove unused rules to avoid impacting checkout validation.
🔴 Red — Shopify’s limit has been reached. You can no longer create new rules, and checkout validation will stop working on the storefront.
When the Shopify limit is exceeded, the app’s rules will no longer run on the checkout page. The app provides early warnings so you can manage your rules proactively and keep checkout functioning properly.

Updated on: 07/07/2026