InvoiceOcean lets you apply promotional codes to products which you sell online (learn how to enable Online AutoPayments).  In order to start using promotional codes go to Payments> Promotional codes > Add new promocode.   

• Promotional code - here you can type the promotional code that will be used by your clients.
• Name - this field lets you name your promotional code.
• Description - here you can describe your promocode.
• Number of available codes - defines the amount of codes that can be used.
• How much has been used - this field is useful if, for example, you have previously used the same code and some of them have been used.
• Date from / date to - lets you set a specific time range in which a code can be used.
• Active - lets you activate and deactivate the code.
• Type of discount - you may choose whether you wish your codes to have Percentage or an Amount discount.
• Discount percent - lets you set the discount percentage.
• Limited to selected products - if you only want your codes to be used on selected products, you may choose them here.