Define invoice format and numbering
Go to the Settings - Billing & taxes menu To enable invoices, click on "Yes". You can define the logo that will appear on your invoices. To do this, click on "Edit".
Drag the image of your choice into the corresponding field, then check the logo. Then click on "Save the logo". Define the numbering options for your invoices. Choose a prefix if applicable.
Choose whether you want to add the current year to the invoice number. Choose whether you want to add the current month to the invoice number. Enter the separator to apply between the numbering elements of your invoices. You can use any character as a separator.
Preview the final result of your numbering. Choose whether you want to reset the invoice numbering to 0 at the beginning of the year. Finally, define the footer of your invoices. Here you can enter text (website, phone number, address, legal notices...) that will appear at the bottom of your invoices.
Click on "Credit note". You can, if you wish, choose a different prefix for your credit notes. Enter the information of your choice in the "Footer" section.
Don't forget to click on "Save" to record your changes.