Support of bank transfer details token

In .module:

/**
 * Provide information about our custom placeholder/token.
 *
 * @see httx://api.drupal.org/api/drupal/modules--system--system.api.php/function/hook_token_info/7
 * @see httx://api.lullabot.com/token_example_token_info/7
 * @return array
 *   An associative array of available tokens and token types.
 */
function commerce_bank_transfer_token_info() {
    $info['tokens']['commerce-order']['order-payment-bank-details'] = array(
        'name' => t('Order payment bank details'),
        'description' => t('Token for details of bank transfer'),
    );
    
    return $info;
}

/**
 * Provide replacement values for placeholder tokens.
 *
 * @see httx://api.drupal.org/api/drupal/modules--system--system.api.php/function/hook_tokens/7
 * @see httx://api.lullabot.com/token_example_tokens/7
 * @param string $type
 *   The machine-readable name of the type (group) of token being replaced, such
 *   as 'node', 'user', or another type defined by a hook_token_info()
 *   implementation.
 * @param array $tokens
 *   An array of tokens to be replaced. The keys are the machine-readable token
 *   names, and the values are the raw [type:token] strings that appeared in the
 *   original text.
 * @param array $data (optional)
 *   An associative array of data objects to be used when generating replacement
 *   values, as supplied in the $data parameter to token_replace().
 * @param array $options (optional)
 *   An associative array of options for token replacement; see token_replace()
 *   for possible values.
 * @return array
 *   An associative array of replacement values, keyed by the raw [type:token]
 *   strings from the original text.
 */
function commerce_bank_transfer_tokens($type, $tokens, array $data = array(), array $options = array()) {
    $replacements = array();
    $sanitize = !empty($options['sanitize']);

    if ($type == 'commerce-order' && !empty($data['commerce-order'])) {
        $order = $data['commerce-order'];

        foreach ($tokens as $name => $original) {
          switch ($name) {
          // Simple key values on the order.
            case 'order-payment-bank-details':
            
            $payment_method = $order->data['payment_method'];
            list($method_id, $rule_name) = explode('|', $payment_method);
            
            if($method_id == 'bank_transfer') {
              $instance_id = $method_id . '|' . "commerce_payment_" . $method_id;
              $bank_transfer = commerce_payment_method_instance_load($instance_id);
              $replacements[$original] = $bank_transfer['settings']['policy'];
            }
            else {
              $replacements[$original] = '';
            }
            
            break;
        }
      }
    }

    return $replacements;
}

Then you can use [commerce-order:order-payment-bank-details] in email template.