Add gateway parameters, this is used to send data to the payment gateway. For advanced users, you can use this option to send custom
options to the payment server or use as checks in other areas of the callback routine. Parameter values are masked for security. You can reveal the values via the
icon. You can
disable having the eye reveal option available via the 'admin/control/options.php' file and the 'SHOW_PARAMETER_EYE_TOGGLE' constant. Note that the eye option is not shown in some examples.
Paypal expects a single parameter, which is your Paypal business / sandbox email address. THIS IS REQUIRED. Example:
Param Name: email
Param Value: you@example.com
You can also include the following if applicable (these are optional):
Param Name: locale
Param Value: EN
Param Name: pagestyle
Param Value: MyStyle
Example of adding above parameters can be seen below:
Parameters are not added until the 'Update' button is clicked. When parameters are added and page is refreshed, a delete option appears on the right. To remove a row, click this icon to remove
the row, then click 'Update'.