<em>(Optional)</em> This is simply the text that will appear on the button when the course can be purchased. If the parameter is not specified, "Purchase" will be displayed as default.
<em>(Optional)</em> This is simply the text that will appear on the button when the course can be purchased. If the parameter is not specified, "Purchase" will be displayed as default.
<em>(Optional)</em> This is simply the text that will appear on the button when the course can be purchased. If the parameter is not specified, "Purchase" will be displayed as default.