G'day, I'm adding a custom complex field to my plugin (for recurring donations) and can't seem to work out how to save a concatenated value for the field. The custom field has multiple parts and I want to concatenate them and save as a formatted string.
RGFormsModel::save_input() only saves fields with a value, sensibly, but how do I give it a value to save? I figured that RGFormsModel::prepare_value() would be the place to hook into for that, but there's no filter hook called from it.
Can you please advise what I need to do here?