Custom variables can be used to ask the user for extra information for a specific package.
You can ask the user for the following information:
Text: Plain text, the user can enter any text they like.
Dropdown: You pre-define selectable items that the user can choose between. You can also charge an extra fee for a specific option.
Alphabetic: Only alphabetic characters are allowed. You can also define the min and max characters.
Numeric: Only numbers are allowed. You can also define the min and max amounts.
Alphanumeric: Both letters and numbers are allowed.
Email: The user must enter a valid email address (valid format).