If the document (invoice) wasn't generated for your Shopify order, review these must-have requirements for smooth operation » Then test it againwith a new order
or manually create the missing document directly from an existing order
Requirements | How To Fix | Explanation |
#1 | Add a customer to the order including billing address, shipping addres | Invoice Ninja requires each invoice to have customer. If it is missing, invoice won't be generated. |
#2 | Set the correct trigger to the document. For example "When order is paid" and Save the settings | Maybe you have set "Never" option to the document you want to create, you it is blocking the creation |