module installs in drupal 9 and admin form works

src/Controller/RoblibIllController.php

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+<?php
+
+namespace Drupal\upei_roblib_ill\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Url;
+use Drupal\Core\Link;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Controller for d3 graphs.
+ */
+class RoblibIllController extends ControllerBase {
+
+  /**
+   * Show the user contact info etc. after ILL Request.
+   * @return string
+   *   Rendered HTML
+   */
+  function finished() {
+    $config = \Drupal::config('upei_roblib_ill.settings');
+    $contact_email = $config->get('ill_contact_email');
+    $contact_phone_number = $config->get('ill_contact_phone');
+    $librarian_link = Link::fromTextAndUrl($this->t('subject-specific'), Url::fromUri('http://library.upei.ca/librarians'))->toString();
+    $help_message = $this->t("We can help! Please contact your !librarian_link librarian if you'd like help finding more resources relating to your topic.",
+      ['!librarian_link' => $librarian_link]);
+    $standard_message = t("To contact the department about this request, you can send a message to @email or
+call @phone.", ['@phone' => $contact_phone_number, '@email' => $contact_email]);
+    if (isset($_GET['error']) && $_GET['error'] === 'FALSE') {
+      $standard_message = t("A message including the Request ID has been sent to @email.", [
+          '@email' => $_GET['email'],
+        ]) . $standard_message;
+    }
+
+    $output = [
+      '#prefix' => '<div upei-roblib-ill-content>',
+      '#suffix' => '</div>',
+      //'#type' => 'page',
+      'dynamic_message' => [
+        '#type' => 'markup',
+        '#markup' => $_GET['message'],
+        '#prefix' => '<div class="upei-roblib-ill-message">',
+        '#suffix' => '</div>',
+      ],
+      'standard_message' => [
+        '#type' => 'markup',
+        '#markup' => $standard_message,
+        '#prefix' => '<div class="upei-roblib-ill-email">',
+        '#suffix' => '</div>',
+      ],
+      'help_message' => [
+        '#type' => 'markup',
+        '#markup' => $help_message,
+        '#allowed_tags' => ['a', 'source'],
+        '#prefix' => '<div class="upei-roblib-ill-help">',
+        '#suffix' => '</div>',
+      ],
+    ];
+    return $output;
+  }
+
+}

src/Form/RoblibIllLoanForm.php

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+<?php
+
+namespace Drupal\upei_roblib_ill\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Settings form for module
+ *
+ * @author ppound
+ */
+class RoblibIllLoanForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'roblib_ill_loan_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    
+
+    $form = [];
+    
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    
+  }
+
+}

src/Form/RoblibIllSettingsForm.php

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+<?php
+
+namespace Drupal\upei_roblib_ill\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Settings form for module
+ *
+ * @author ppound
+ */
+class RoblibIllSettingsForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'roblib_ill_settings_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = \Drupal::config('upei_roblib_ill.settings');
+
+    $form = [];
+    $form['ill_add_url'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('The Relais AddRequest URL'),
+      '#description' => t('The URL for the Relais ILL server AddRequest service, the default is
+    https://caul-cbua.relais-host.com/portal-service/request/add'),
+      '#default_value' => $config->get('ill_add_url'),
+    ];
+    $form['ill_auth_url'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('The Relais Auth URL'),
+      '#description' => t('The URL for the Relais ILL server Auth service (retrieve the aid), the default is
+    https://caul-cbua.relais-host.com/portal-service/user/authentication'),
+      '#default_value' => $config->get('ill_auth_url'),
+    ];
+    $form['ill_library_symbol'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('Your Relais Library Symbol'),
+      '#description' => t('Your Relais Library Symbol'),
+      '#default_value' => $config->get('ill_library_symbol'),
+    ];
+
+    $form['ill_relais_key'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('The Relais API key'),
+      '#description' => t('The API key used to communicate with the Relais API, Contact Relais International to get your key'),
+      '#default_value' => $config->get('ill_relais_key'),
+    ];
+    $form['ill_doi_openurl_pid'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('OpenURL PID'),
+      '#description' => t('An identifier to call yourself, for the OpenURL endpoint. To use this service you first need to register for an account here: http://www.crossref.org/requestaccount/'),
+      '#default_value' => $config->get('ill_doi_openurl_pid'),
+    ];
+    $form['ill_contact_email'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('Contact Email'),
+      '#description' => t('The email address we want to show after a user has submitted an ILL request, Roblib uses ill@upei.ca'),
+      '#default_value' => $config->get('ill_contact_email'),
+    ];
+    $form['ill_contact_phone'] = [
+      '#required' => TRUE,
+      '#type' => 'textfield',
+      '#size' => 200,
+      '#title' => t('Contact Phone Number'),
+      '#description' => t('The phone number we want to show to the user after a user has submitted an ILL request, Roblib uses 902-566-0445'),
+      '#default_value' => $config->get('ill_contact_phone'),
+    ];
+    $form['ill_header_message'] = [
+      '#required' => TRUE,
+      '#type' => 'textarea',
+      '#title' => t('ILL Header Message'),
+      '#description' => t('The message that appears at the top of the ILL form, recently used for Covid messages.  Leave this blank for no message to appear at the top of the form.'),
+      '#default_value' => $config->get('ill_header_message'),
+    ];
+     $form['actions']['submit'] = [
+      '#type' => 'submit',
+      '#value' => t('Save'),
+      '#button_type' => 'primary',
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $config = \Drupal::configFactory()->getEditable('upei_roblib_ill.settings');
+    $config->set('ill_add_url', $form_state->getValue('ill_add_url'))->save();
+    $config->set('ill_auth_url', $form_state->getValue('ill_auth_url'))->save();
+    $config->set('ill_library_symbol', $form_state->getValue('ill_library_symbol'))->save();
+    $config->set('ill_relais_key', $form_state->getValue('ill_relais_key'))->save();
+    $config->set('ill_doi_openurl_pid', $form_state->getValue('ill_doi_openurl_pid'))->save();
+    $config->set('ill_contact_email', $form_state->getValue('ill_contact_email'))->save();
+    $config->set('ill_contact_phone', $form_state->getValue('ill_contact_phone'))->save();
+    $config->set('ill_header_message', $form_state->getValue('ill_header_message'))->save();
+  }
+
+}

upei_roblib_ill.info.yml

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+name: Roblib ILL Loan Forms
+type: module
+configure: upei_roblib_ill.settings
+description: Provides a front end for our Inter Library Loan users.
+package: Roblib ILL
+core_version_requirement: ^9
+dependancies:

upei_roblib_ill.routing.yml

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+roblib_ill.settings:
+  path: 'admin/settings/roblibill'
+  defaults:
+    _form: '\Drupal\upei_roblib_ill\Form\RoblibIllSettingsForm'
+    _title: 'Roblib ILL Settings Form'
+  requirements:
+    _permission: 'administer site configuration'
+    
+roblib_ill.loan_form:
+  path: 'upei/roblib/ill/{parameters}'
+  defaults:
+    _form: '\Drupal\upei_roblib_ill\Form\RoblibIllLoanForm'
+    _title: 'Roblib ILL Loan Form'
+    parameters: '[a-zA-Z\s]+'
+  requirements:
+    _permission: 'access content'
+    
+roblib_ill.loan_form_finished:
+  path: 'upei/roblib/ill/finished'
+  defaults:
+    _controller: '\Drupal\upei_roblib_ill\Controller\RoblibIllController::finished'
+    _title: 'Inter Library Loan Completed'
+  requirements:
+    _permission: 'access content'