The Simple module is one of the most popular modules for simplifying checkout and registration in OpenCart 3. However, after its installation, a critical error may occur related to an outdated modification of the Twig template engine.
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→If you encounter the message "You need to specify a shipping method!" or "No payment options are available for the specified address. Please contact us for clarification!" during checkout, this means that the shipping selection for the product is not activated, or payment methods are not configured.
1) To fix this, open the product in the admin panel, go to the "Data" tab, and set "Yes" for the "Requires Shipping" field.
2) If you do not provide shipping to customers, be sure to add at least two payment options through the menu Extensions - Extensions - Choose extension type - Payment, such as "Cash on Delivery" or "Bank Transfer".
If you have many products, you can run a database query (remember, your prefix might not be oc_):
UPDATE `oc_product` SET `shipping`=' 1
Details on working with queries and their application can be found in the article Bulk Editing and Deleting Data in OcStore 3.
3) Additionally, the store may use an algorithm to hide shipping based on Geo Zone or other specific settings.