It looks like you're new here. If you want to get involved, click one of these buttons!
As far as I can see there is no option to add a custom field with a Boolean data type (True/False). That would really be useful. Any change that can be added?
You can pass 'true' or 'false' strings inside a text custom field. Then in your backend script use an "if else" statement to check if the value passed is 'true' or 'false' then process accordingly. You can even use 'yes' or 'no'.