Checkout Gateflow runs if-then rules at checkout for shipping, payment, validation, and discounts. Hide or rename shipping and payment methods, block checkout with a custom message (for example P.O. Boxes), or offer a percentage off or free shipping. Match on country, province, cart total, quantity, address, company, customer tags, products, collections. Rules run as Shopify Functions—no theme embed. Use ready-made templates

• Hide or rename shipping methods by country, cart, products, tags, or collection.
• Hide or rename payment methods like COD and PayPal using if-then checkout rules.
• Validation rules: block checkout with a custom error, including P.O. Box checks.
• Discount rules: percentage off the order or free shipping when conditions match.
• Match location, cart, customer, products, and collections—no theme embed needed.