diff --git a/payment/payment.module b/payment/payment.module
index c094da0..efc4d92 100644
--- a/payment/payment.module
+++ b/payment/payment.module
@@ -406,48 +406,6 @@ function payment_payment_delete(PaymentInterface $payment) {
 }
 
 /**
- * Implements hook_views_api().
- */
-function payment_views_api() {
-  return array(
-    'api' => '2',
-    'path' => drupal_get_path('module', 'payment') . '/views',
-  );
-}
-
-/**
- * Convert an amount as a float to a human-readable format.
- *
- * @param float $amount
- * @param string $currency_code
- *
- * @return string
- */
-function payment_amount_human_readable($amount, $currency_code = NULL) {
-  if (payment_currency_version() === 2) {
-    $currency = currency_load($currency_code);
-    if ($currency) {
-      return $currency->format($amount);
-    }
-  }
-  $amount_string = number_format($amount, 2, '.', '');
-  $decimal_separator_position = strpos($amount_string, '.');
-  $arguments = array(
-    '!currency_code' => $currency_code,
-    '!units' => substr($amount_string, 0, $decimal_separator_position),
-    '!cents' => substr($amount_string, $decimal_separator_position + 1),
-  );
-  return $currency_code ? t('!currency_code !units.!cents', $arguments) : t('!units.!cents', $arguments);
-}
-
-/**
- * Implements Rules access callback.
- */
-function payment_rules_access($type, $name) {
-  return user_access('payment.rules.administer');
-}
-
-/**
  * Check if a user has access to perform a certain payment method operation and
  * do additional token validation.
  *
@@ -513,38 +471,3 @@ function payment_debug($message, $file = '', $line = 0) {
     watchdog('Payment', $string, $string_arguments);
   }
 }
-
-/**
- * Checks what version of Currency is installed, if any.
- *
- * @return integer|false
- *   An integer major version, or FALSE if the module is not available.
- */
-function payment_currency_version() {
-  // Currency.module 7.x-1.x and 7.x-2.x both exist, but currency_load() only
-  // exists in 7.x-2.x.
-  if (module_exists('currency') && function_exists('currency_load')) {
-    return 2;
-  }
-  elseif (module_exists('currency_api')) {
-    return 1;
-  }
-  return FALSE;
-}
-
-/**
- * Returns an options list of currencies.
- *
- * @return array
- *  Keys are ISO 4217 codes and values are currency titles.
- */
-function payment_currency_options() {
-  $version = payment_currency_version();
-  if ($version == 2) {
-    return currency_options();
-  }
-  if ($version == 1) {
-    return currency_api_get_list();
-  }
-  return array();
-}
diff --git a/payment/payment.payment.inc b/payment/payment.payment.inc
deleted file mode 100644
index af38762..0000000
--- a/payment/payment.payment.inc
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-/**
- * @file
- * Payment hooks.
- */
-
-/**
- * Implements hook_payment_line_item_info().
- */
-function payment_payment_line_item_info() {
-  return array(
-    new PaymentLineItemInfo(array(
-      'callback' => 'payment_line_item_get_all',
-      'name' => 'payment_all',
-      'title' => t('All items'),
-    )),
-  );
-}
\ No newline at end of file
diff --git a/payment/payment.rules.inc b/payment/payment.rules.inc
deleted file mode 100644
index 7006e0b..0000000
--- a/payment/payment.rules.inc
+++ /dev/null
@@ -1,579 +0,0 @@
-<?php
-
-/**
- * @file
- * Rules integration.
- */
-
-/**
- * Implements hook_rules_event_info().
- */
-function payment_rules_event_info() {
-  $event['payment_status_set'] = array(
-    'label' => t("After setting a payment's status"),
-    'group' => t('Payment'),
-    'access callback' => 'payment_rules_access',
-    'variables' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-      'payment_old_status' => array(
-        'type' => 'text',
-        'label' => t("The payment's old status"),
-      ),
-    ),
-  );
-  $event['payment_pre_execute'] = array(
-    'label' => t('Before executing a payment'),
-    'group' => t('Payment'),
-    'access callback' => 'payment_rules_access',
-    'variables' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-    ),
-  );
-  $event['payment_pre_resume'] = array(
-    'label' => t("When resuming the user's work after finishing payment execution"),
-    'group' => t('Payment'),
-    'access callback' => 'payment_rules_access',
-    'variables' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-    ),
-  );
-  $event['payment_validate'] = array(
-    'label' => t('When validating a payment against an arbitrary payment method'),
-    'group' => t('Payment'),
-    'access callback' => 'payment_rules_access',
-    'variables' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-      'payment_method' => array(
-        'type' => 'payment_method',
-        'label' => t('Payment method'),
-        'description' => t('The payment method the variable is validated against.'),
-      ),
-    ),
-  );
-
-  return $event;
-}
-
-/**
- * Implements hook_rules_action_info().
- */
-function payment_rules_action_info() {
-  $actions['payment_rules_action_payment_set_status'] = array(
-    'label' => t('Set payment status'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Label'),
-      ),
-      'status' => array(
-        'type' => 'text',
-        'label' => t('Status'),
-        'options list' => 'payment_status_options',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $actions['payment_rules_action_payment_line_item_delete'] = array(
-    'label' => t('Delete a payment line item'),
-    'access callback' => 'payment_rules_access',
-    'group' => t('Payment'),
-    'parameter' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-      'name' => array(
-        'type' => 'text',
-        'label' => t('Machine name'),
-      ),
-    ),
-  );
-  $description = array(t('If the evaluated amount does not return a whole or fractional number, this action will do nothing.'));
-  $description[] = module_exists('ctools') ? t('You can use mathematical expressions.') : t('Enable <a href="http://drupal.org/project/ctools">Chaos tool suite</a> in order to use mathematical expressions.');
-  $description = implode(' ', $description);
-  $actions['payment_rules_action_payment_line_item_add'] = array(
-    'label' => t('Add a line item'),
-    'access callback' => 'payment_rules_access',
-    'group' => t('Payment'),
-    'parameter' => array(
-      'payment' => array(
-        'type' => 'payment',
-        'label' => t('Payment'),
-      ),
-      'name' => array(
-        'type' => 'text',
-        'label' => t('Machine name'),
-      ),
-      'description' => array(
-        'type' => 'text',
-        'label' => t('Description'),
-        'translatable' => TRUE,
-      ),
-      'tax_rate' => array(
-        'type' => 'decimal',
-        'label' => t('Tax rate'),
-        'description' => t('Enter a (fractional) number between 0 and 1.'),
-        'default value' => 0,
-      ),
-      'quantity' => array(
-        'type' => 'integer',
-        'label' => t('Quantity'),
-        'default value' => 1,
-      ),
-      'amount' => array(
-        'type' => 'text',
-        'label' => t('Amount'),
-        'description' => $description,
-      ),
-    ),
-  );
-  $actions['payment_rules_action_payment_invalidate'] = array(
-    'label' => t('Invalidate the combination of payment and payment method'),
-    'access callback' => 'payment_rules_access',
-    'group' => t('Payment'),
-    'parameter' => array(
-      'message' => array(
-        'type' => 'text',
-        'label' => t('Message'),
-      ),
-    ),
-  );
-
-  return $actions;
-}
-
-/**
- * Implements hook_rules_condition_info().
- */
-function payment_rules_condition_info() {
-  $conditions['payment_rules_condition_payment_status_is'] = array(
-    'label' => t('Payment status is'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'payment_statuses' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment status'),
-        'options list' => 'payment_status_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_status_has_ancestor'] = array(
-    'label' => t('Payment status is derived from'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'payment_statuses' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment status is or is derived from'),
-        'options list' => 'payment_status_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_uses_payment_method'] = array(
-    'label' => t('Payment uses payment method (deprecated)'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'pmids' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment methods'),
-        'options list' => 'payment_method_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_method_comparison'] = array(
-    'label' => t('Payment method is'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment_method' => array(
-        'label' => t('Payment method'),
-        'type' => 'payment_method',
-        'restriction' => 'selector',
-      ),
-      'pmids' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment methods'),
-        'options list' => 'payment_method_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_uses_payment_method_type'] = array(
-    'label' => t('Payment uses payment method of type (deprecated)'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'payment_method_controller_class_names' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment method types'),
-        'options list' => 'payment_method_controller_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_method_type_comparison'] = array(
-    'label' => t('Payment method is of type'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment_method' => array(
-        'label' => t('Payment method'),
-        'type' => 'payment_method',
-        'restriction' => 'selector',
-      ),
-      'payment_method_controller_class_names' => array(
-        'type' => 'list<text>',
-        'label' => t('Payment method types'),
-        'options list' => 'payment_method_controller_options',
-        'restriction' => 'input',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_method_controller_supports_currency'] = array(
-    'label' => t('Payment uses payment method of a type that supports currency (deprecated)'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'currency' => array(
-        'type' => 'text',
-        'label' => t('Currency code'),
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_method_supports_currencies'] = array(
-    'label' => t('Payment method supports currency'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment_method' => array(
-        'label' => t('Payment method'),
-        'type' => 'payment_method',
-        'restriction' => 'selector',
-      ),
-      'currency' => array(
-        'type' => 'list<text>',
-        'label' => t('Currency code'),
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-  $conditions['payment_rules_condition_payment_amount_comparison'] = array(
-    'label' => t('Payment amount comparison'),
-    'access callback' => 'payment_rules_access',
-    'parameter' => array(
-      'payment' => array(
-        'label' => t('Payment'),
-        'type' => 'payment',
-        'restriction' => 'selector',
-      ),
-      'operator' => array(
-        'type' => 'text',
-        'label' => t('Comparison operator'),
-        'default value' => '<=',
-        'options list' => 'payment_numeric_comparison_operator_options',
-        'restriction' => 'input',
-      ),
-      'comparison_amount' => array(
-        'type' => 'decimal',
-        'label' => t('Amount'),
-        'default value' => '0',
-      ),
-    ),
-    'group' => t('Payment'),
-  );
-
-  return $conditions;
-}
-
-/**
- * Implements Rules condition callback: check whether a payment's status
- * is one of the selected statuses.
- *
- * @param Payment $payment
- *   The payment to check the condition for.
- * @param array $payment_statuses
- *   An array with payment statuses.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_status_is(Payment $payment, array $payment_statuses) {
-  return in_array($payment->getStatus()->status, $payment_statuses);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment's status
- * is a child of any of the selected statuses.
- *
- * @param Payment $payment
- *   The payment to check the condition for.
- * @param array $payment_statuses
- *   An array with payment statuses.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_status_has_ancestor(Payment $payment, array $payment_statuses) {
-  foreach ($payment_statuses as $payment_status) {
-    if (payment_status_has_ancestor($payment->getStatus()->status, $payment_status)) {
-      return TRUE;
-    }
-  }
-  return FALSE;
-}
-
-/**
- * Implements Rules action callback for payment_rules_payment_set_status.
- */
-function payment_rules_action_payment_set_status(Payment $payment, $status_data) {
-  $payment->setStatus(reset($status_data));
-}
-
-/**
- * Implements Rules action callback: add a line item.
- *
- * @param Payment $payment
- * @param string $name
- *   The line item's unique machine name.
- * @param string $description
- * @param float $tax_rate
- * The tax rate that applies to the amount. Should be a float between 0 and 1.
- * @param integer $quantity
- * @param integer|string $amount
- *   The amount of money, either as an integer or string that contains
- *   placeholders or a Ctools math expression.
- */
-function payment_rules_action_payment_line_item_add(Payment $payment, $name, $description, $tax_rate, $quantity, $amount) {
-  if (!is_numeric($amount)) {
-    // Replace placeholders.
-    $amount = token_replace($amount, array(
-      'payment' => $payment,
-    ));
-
-    // Evaluate Ctools math expression.
-    if (module_exists('ctools')) {
-      $math = new ctools_math_expr;
-      $amount = $math->evaluate($amount);
-    }
-  }
-  if (is_numeric($amount)) {
-    $payment->setLineItem(new PaymentLineItem(array(
-      'name' => $name,
-      'amount' => $amount,
-      'description' => $description,
-      'tax_rate' => $tax_rate,
-      'quantity' => $quantity,
-    )));
-  }
-}
-
-/**
- * Implements Rules action callback: invalidate a combination of a payment and
- * a payment method.
- *
- * @throws PaymentValidatioNException
- *
- * @param $message
- *
- * @return NULL
- */
-function payment_rules_action_payment_invalidate($message) {
-  throw new PaymentValidationException($message);
-}
-
-
-/**
- * Implements Rules options list callback for
- * payment_rules_action_payment_line_item_set_calculated().
- */
-function payment_rules_options_list_payment_line_item_name() {
-  $options = array();
-  foreach (payment_line_items_info() as $line_item_info) {
-    $options[$line_item_info->name] = $line_item_info->title;
-  }
-
-  return $options;
-}
-
-/**
- * Implements Rules action callback: delete a line item.
- *
- * @param Payment $payment
- * @param string $name
- *   The machine name of the line item to delete.
- */
-function payment_rules_action_payment_line_item_delete(Payment $payment, $name) {
-  unset($payment->line_items[$name]);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment uses one of the
- * selected payment methods.
- *
- * This function is deprecated. Use
- * payment_rules_condition_payment_method_comparison() instead.
- *
- * @see payment_rules_condition_payment_method_comparison()
- *
- * @param Payment $payment
- *   The payment to check the condition for.
- * @param array $pmids
- *   An array with payment method IDs.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_uses_payment_method(Payment $payment, array $pmids) {
-  return $payment->method && payment_rules_condition_payment_method_comparison($payment->method, $pmids);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment method is one
- * of the given payment methods.
- *
- * @param PaymentMethod $payment_method
- *   The payment method to check the condition for.
- * @param array $pmids
- *   An array with payment method IDs.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_method_comparison(PaymentMethod $payment_method, array $pmids) {
-  return in_array($payment_method->pmid, $pmids);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment uses one of the
- * selected payment methods types.
- *
- * This function is deprecated. Use
- * payment_rules_condition_payment_method_type_comparison() instead.
- *
- * @see payment_rules_condition_payment_method_type_comparison()
- *
- * @param Payment $payment
- *   The payment to check the condition for.
- * @param array $payment_method_controller_class_names
- *   An array with class names of payment method controllers.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_uses_payment_method_type(Payment $payment, array $payment_method_controller_class_names) {
-  return $payment->method && payment_rules_condition_payment_method_type_comparison($payment->method, $payment_method_controller_class_names);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment method uses one
- * of the given controllers.
- *
- * @param PaymentMethod $payment_method
- *   The payment method to check the condition for.
- * @param array $payment_method_controller_class_names
- *   An array with class names of payment method controllers.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_method_type_comparison(PaymentMethod $payment_method, array $payment_method_controller_class_names) {
-  return in_array($payment_method->controller->name, $payment_method_controller_class_names);
-}
-
-/**
- * Implements Rules condition callback: check whether a payment method
- * controller supports a currency.
- *
- * This function is deprecated. Use
- * payment_rules_condition_payment_method_supports_currencies() instead.
- *
- * @see payment_rules_condition_payment_method_supports_currencies()
- *
- * @param Payment $payment
- *   The payment to check the condition for.
- * @param string $currency_code
- *   The ISO 4217 currency code to check for.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_method_controller_supports_currency(Payment $payment, $currency_code) {
-  return $payment->method && payment_rules_condition_payment_method_supports_currencies($payment->method, array($currency_code));
-}
-
-/**
- * Implements Rules condition callback: check whether a payment method supports
- * a currency.
- *
- * @param PaymentMethod $payment_method
- *   The payment method to check the condition for.
- * @param array $currency_codes
- *   The ISO 4217 currency codes to check for.
- *
- * @return boolean
- */
-function payment_rules_condition_payment_method_supports_currencies(PaymentMethod $payment_method, array $currency_codes) {
-  return empty($payment_method->controller->currencies) || (bool) array_intersect($currency_codes, array_keys($payment_method->controller->currencies));
-}
-
-/**
- * Implements Rules condition callback: compare the payment amount.
- *
- * @param Payment $payment
- *   The payment of which to compare the amount.
- * @param string $comparison_operator
- * @param string $comparison_amount
- *
- * @return boolean
- */
-function payment_rules_condition_payment_amount_comparison(Payment $payment, $operator, $comparison_amount) {
-  $payment_amount = $payment->totalAmount(TRUE);
-  switch ($operator) {
-    case '<':
-      return $payment_amount < $comparison_amount;
-    case '<=':
-      return $payment_amount <= $comparison_amount;
-    case '=':
-      return $payment_amount == $comparison_amount;
-    case '>=':
-      return $payment_amount >= $comparison_amount;
-    case '>':
-      return $payment_amount > $comparison_amount;
-  }
-  return FALSE;
-}
diff --git a/payment/payment.ui.inc b/payment/payment.ui.inc
index 213b04b..17797ac 100644
--- a/payment/payment.ui.inc
+++ b/payment/payment.ui.inc
@@ -6,41 +6,6 @@
  */
 
 /**
- * Menu title callback: return a payment's title.
- *
- * @param Payment $payment
- *
- * @return string
- */
-function payment_title(Payment $payment) {
-  return t('Payment !pid', array(
-    '!pid' => $payment->pid,
-  ));
-}
-
-/**
- * Menu page callback: show a message that describes the dependencies for
- * viewing this page have not been met.
- *
- * @param array $modules
- *   Keys are modules' machine names or numeric, values are modules'
- *   human-readable titles.
- *
- * @return string
- */
-function payment_page_required_modules(array $modules) {
-  foreach ($modules as $name => &$title) {
-    if (is_string($name)) {
-      $title = l($title, 'http://drupal.org/project/' . $name);
-    }
-  }
-
-  return t('This page requires !modules.', array(
-    '!modules' => implode(', ', $modules),
-  ));
-}
-
-/**
  * Menu page callback: show a payment.
  *
  * @param Payment $payment
@@ -594,16 +559,3 @@ function payment_form_global_configuration(array $form, array &$form_state) {
 
   return system_settings_form($form);
 }
-
-/**
- * Returns an array of numerical comparison operators for use in Rules.
- */
-function payment_numeric_comparison_operator_options() {
-  return array(
-    '<' => t('lesser than'),
-    '<=' => t('lesser than or equal to'),
-    '=' => t('equal to'),
-    '>=' => t('greater than or equal to'),
-    '>' => t('greater than'),
-  );
-}