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$this->fields_options = array(
  'general' => array(
    ['title'] => $this->l('Carrier options'),                      // Th title of the fieldset. If missing, default is 'Options'.
    ['top'] => $this->l('Text to display before the fieldset'),	   // This text is display right above the first. Rarely used.
    ['image'] => 'url to icon',                                    // If missing, will use the default icon for the tab.
    ['description'] => $this->l('Display as description'),         // Displays an informational box above the fields.	
    ['info'] => $this->l('Display as info'),                       // Displays an unstyled text above the fields.
    'fields' => array(                                             // The various option fields.
      'PS_CARRIER_DEFAULT' => array(                               // The aray is named after the option's ID. It must be the same
name as                                                                  // same name //as the value stored in the ps_configuration table.
        ['title'] => $this->l('Default carrier:'),                 // The name of the option.
        ['desc'] => $this->l('The default carrier used in shop'),  // The description of the option.
        ['cast'] => 'intval',                                      // Using this option, you can cast the variable's content
into a known value.                                                                // into a known //value. You can use boolval, floatval, intval 
                                                                   // or strval depending on value type you want to receive.
        'type' => {'text', 'hidden', 'select', 'bool', 'radio',    // The kind of input field you want to use. 
          'checkbox', 'password', 'textarea', 'file', 'textLang', 
          'textareaLang', 'selectLang'},
        ['suffix'] => 'kg',                                        // Display after the field (ie. currency)Only.
for text field                                                                   // For text fields or password fieldfields only.
        ['identifier'] => 'id_carrier',                            // The unique ID for the form.
        ['list'] => array(list do display as options),             // For select field only.
        ['empty_message'] => $this->l('Display if list is empty'), // For select field only
        ['cols'] => 40,                                            // For textarea fields only.
        ['rows'] => 5,                                             // For textarea fields only.
        ['thumb'] => 'url to thumb image',                         // For file fields only.
        ['is_invisible'] => {true, false}                          // Disable the field depending on shop context.
      ),
      'ANOTHER_FIELD' => array(
        ...
      ),
    ),
    'submit' => array()
  ),
  'another fieldset' => ...
);