When creating one click orders the creation process might fail, this could be due to a variety of reasons and each would have their own error message, here is a list of the erros and what they refer to:

This error can occur for several reasons:
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Credentials have expired, meaning the access permissions to the shop are no longer valid.

Credentials are no longer valid, indicating that the credentials provided are incorrect or have been modified. (Users can also intentionally revoke their credentials, thereby denying access to the shop)

In rare cases, the shop can be unreachable, which may suggest a network issue. This error typically happens when the system cannot establish a connection to the shop's server.

This error is related to the absence of products in a customer's order. It occurs when there are no products included in the order.

This error occurs when the required shipping address information is missing. It should not cause an error if the order consists only of virtual products, as these products may not require a physical shipping address.

This error suggest issues with individual products, the product is not visible, he has specific restrictions on the store in question, product is out of stock.

This could be related to customizable items, please see this article for more details

This error occurs when a line item or product cannot be found. It typically manifests as a 404 error when attempting to search for the product. The product may not exist in the store's inventory or cannot be located on our side.

BigCommerce allows users to define product "modifiers". If these modifiers are not configured as having default values, we cannot create orders on your BigCommerce store. Please 🔗 read this article to learn more about configuring Modifiers.