Display error for minimum subtotal not met

Is there a way to check which payment module is chosen (id) at the checkout so I can use that information to give an error for a minimum subtotal depending on the module?

In module options(), add the condition:

if ($subtotal < 100) {
  $error = 'Minimum subtotal not reached';
}

And return the error with the option:

return [
  ...
  'options' => [
    [
      ..
      'error' => $error,
    ]
  ]
];

https://www.litecart.net/en/wiki/how_to_create_a_payment_module

Thanks Tim, works Perfect!

 $fee= 0;
    if ($subtotal < $this->settings['minorder']) {  
    $fee = $this->settings['fee'];
    }

      $method = [
        'title' => $this->name,
        'description' => language::translate(__CLASS__.':description', ''),
        'options' => [
          [
            'id' => 'por',
            'icon' => $this->settings['icon'],
            'name' => reference::country($country_code)->name,
            'description' => '',
            'fields' => '',
      'minorder' => $this->settings['minorder'],
            'cost' => $fee,
            'tax_class_id' => $this->settings['tax_class_id'],
            'confirm' => language::translate(__CLASS__.':title_confirm_order', 'Confirm Order'),
          ],
        ]
      ];