//now use displayError() in modules

modules/referralprogram/referralprogram.php

@@ -655,4 +655,85 @@ class ReferralProgram extends Module
 		}
 		return false;
 	}
+	
+	public function renderForm()
+	{	
+		$fields_form_1 = array(
+			'form' => array(
+				'legend' => array(
+					'title' => $this->l('Settings'),
+					'icon' => 'icon-cogs'
+				),
+				'input' => array(
+					array(
+						'type' => 'text',
+						'name' => '',
+						'class' => 'fixed-width-md',
+						'label' => $this->l('Minimum number of orders a sponsored friend must place to get their voucher:'),
+					),
+				), 
+				'submit' => array(
+					'title' => $this->l('Delete catalog'),
+					'class' => 'btn btn-primary',
+					'name' => 'submitTruncateCatalog',
+					'id' => 'submitTruncateCatalog',
+					)
+			),
+		);
+		
+		$fields_form_2 = array(
+			'form' => array(
+				'legend' => array(
+					'title' => $this->l('Orders and customers'),
+					'icon' => 'icon-cogs'
+				),
+				'description' => $this->l('I understand that all the orders and customers will be removed without possible rollback: customers, carts, orders, connections, guests, messages, stats...'),
+				'submit' => array(
+					'title' => $this->l('Delete orders & customers'),
+					'class' => 'btn btn-primary',
+					'name' => 'submitTruncateSales',
+					'id' => 'submitTruncateSales',
+					)
+			),
+		);
+		
+		$fields_form_3 = array(
+			'form' => array(
+				'legend' => array(
+					'title' => $this->l('Functional integrity constraints'),
+					'icon' => 'icon-cogs'
+				),
+			'submit' => array(
+				'title' => $this->l('Check & fix'),
+				'class' => 'btn btn-primary',
+				'name' => 'submitCheckAndFix',
+				)
+			),
+		);
+		
+		$helper = new HelperForm();
+		$helper->show_toolbar = false;
+		$helper->table =  $this->table;
+		$lang = new Language((int)Configuration::get('PS_LANG_DEFAULT'));
+		$helper->default_form_language = $lang->id;
+		$helper->allow_employee_form_lang = Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') ? Configuration::get('PS_BO_ALLOW_EMPLOYEE_FORM_LANG') : 0;
+		$this->fields_form = array();
+		$helper->id = (int)Tools::getValue('id_carrier');
+		$helper->identifier = $this->identifier;
+		$helper->submit_action = 'btnSubmit';
+		$helper->currentIndex = $this->context->link->getAdminLink('AdminModules', false).'&configure='.$this->name.'&tab_module='.$this->tab.'&module_name='.$this->name;
+		$helper->token = Tools::getAdminTokenLite('AdminModules');
+		$helper->tpl_vars = array(
+			'fields_value' => $this->getConfigFieldsValues(),
+			'languages' => $this->context->controller->getLanguages(),
+			'id_language' => $this->context->language->id
+		);
+
+		return $helper->generateForm(array($fields_form_1, $fields_form_2, $fields_form_3));
+	}
+	
+	public function getConfigFieldsValues()
+	{
+		return array('value' => '');
+	}
 }