The source node in most cases contains the sample message as written by the developer. If it looks like a dot-delimitted string such as "form.label.firstname", then the developer has not provided a default message.

Basket with ID: %basketId% not found Basket with ID: %basketId% not found key: Basket with ID: %basketId% not found Error: %error% Error: %error% key: Error: %error% Order Management Order Management key: Order Management Order confirmation Order confirmation key: Order confirmation Order for basket: %basketId% has been processed successfully, Order-ID: %orderId% Order for basket: %basketId% has been processed successfully, Order-ID: %orderId% key: Order for basket: %basketId% has been processed successfully, Order-ID: %orderId% Invoice_ Invoice_ key: common.invoice_ Order confirmation for Shop Owner Order confirmation for Shop Owner key: common.shop_owner_mail_subject