diff --git a/app/frontend/src/javascript/controllers/admin/events.js b/app/frontend/src/javascript/controllers/admin/events.js
index 5e696df77..cf938866a 100644
--- a/app/frontend/src/javascript/controllers/admin/events.js
+++ b/app/frontend/src/javascript/controllers/admin/events.js
@@ -436,7 +436,7 @@ Application.Controllers.controller('AdminEventsController', ['$scope', '$state',
 /**
  * Controller used in the reservations listing page for a specific event
  */
-Application.Controllers.controller('ShowEventReservationsController', ['$scope', 'eventPromise', 'reservationsPromise', 'dialogs', 'SlotsReservation', 'growl', '_t', function ($scope, eventPromise, reservationsPromise, dialogs, SlotsReservation, growl, _t) {
+Application.Controllers.controller('ShowEventReservationsController', ['$scope', 'eventPromise', 'reservationsPromise', 'dialogs', 'SlotsReservation', 'growl', '_t', 'Price', 'Wallet', '$uibModal', function ($scope, eventPromise, reservationsPromise, dialogs, SlotsReservation, growl, _t, Price, Wallet, $uibModal) {
   // retrieve the event from the ID provided in the current URL
   $scope.event = eventPromise;
 
@@ -487,6 +487,71 @@ Application.Controllers.controller('ShowEventReservationsController', ['$scope',
       });
     });
   };
+
+  const mkCartItems = function (reservation, coupon) {
+    return {
+      customer_id: reservation.user_id,
+      items: [{
+        reservation: {
+          ...reservation,
+          slots_reservations_attributes: reservation.slots_reservations_attributes.map(sr => ({ slot_id: sr.slot_id }))
+        }
+      }],
+      coupon_code: ((coupon ? coupon.code : undefined)),
+      payment_method: ''
+    };
+  };
+
+  $scope.payReservation = function (reservation) {
+    $uibModal.open({
+      templateUrl: '/admin/events/pay_reservation_modal.html',
+      size: 'sm',
+      resolve: {
+        reservation () {
+          return reservation;
+        },
+        price () {
+          return Price.compute(mkCartItems(reservation)).$promise;
+        },
+        wallet () {
+          return Wallet.getWalletByUser({ user_id: reservation.user_id }).$promise;
+        },
+        cartItems () {
+          return mkCartItems(reservation);
+        }
+      },
+      controller: ['$scope', '$uibModalInstance', 'reservation', 'price', 'wallet', 'cartItems', 'helpers', '$filter', '_t',
+        function ($scope, $uibModalInstance, reservation, price, wallet, cartItems, helpers, $filter, _t) {
+          // User's wallet amount
+          $scope.wallet = wallet;
+
+          // Price
+          $scope.price = price.price;
+
+          // Cart items
+          $scope.cartItems = cartItems;
+
+          // price to pay
+          $scope.amount = helpers.getAmountToPay(price.price, wallet.amount);
+
+          // Reservation
+          $scope.reservation = reservation;
+
+          $scope.coupon = { applied: null };
+
+          // Button label
+          if ($scope.amount > 0) {
+            $scope.validButtonName = _t('app.admin.event_reservations.confirm_payment_of_html', { ROLE: $scope.currentUser.role, AMOUNT: $filter('currency')($scope.amount) });
+          } else {
+            if ((price.price > 0) && ($scope.walletAmount === 0)) {
+              $scope.validButtonName = _t('app.admin.event_reservations.confirm_payment_of_html', { ROLE: $scope.currentUser.role, AMOUNT: $filter('currency')(price.price) });
+            } else {
+              $scope.validButtonName = _t('app.shared.buttons.confirm');
+            }
+          }
+        }]
+    });
+  };
 }]);
 
 /**
diff --git a/app/frontend/templates/admin/events/pay_reservation_modal.html b/app/frontend/templates/admin/events/pay_reservation_modal.html
new file mode 100644
index 000000000..3b92cae4e
--- /dev/null
+++ b/app/frontend/templates/admin/events/pay_reservation_modal.html
@@ -0,0 +1,18 @@
+<div class="modal-header">
+  <img ng-src="{{logoBlack.custom_asset_file_attributes.attachment_url}}" alt="{{logo.custom_asset_file_attributes.attachment}}" class="modal-logo"/>
+  <h1 translate ng-show="reservation">{{ 'app.admin.event_reservations.confirm_payment' }}</h1>
+</div>
+<div class="modal-body">
+  <uib-alert ng-repeat="alert in alerts" type="{{alert.type}}" close="closeAlert($index)">{{alert.msg}}</uib-alert>
+  <div class="row">
+    <wallet-info current-user="currentUser"
+                 cart="cartItems"
+                 price="price"
+                 wallet="wallet"/>
+  </div>
+  <coupon show="true" coupon="coupon.applied" total="price.price_without_coupon" user-id="{{reservation.user_id}}"></coupon>
+</div>
+<div class="modal-footer">
+  <button class="btn btn-info" ng-click="ok()" ng-disabled="attempting" ng-bind-html="validButtonName"></button>
+  <button class="btn btn-default" ng-click="cancel()" translate>{{ 'app.shared.buttons.cancel' }}</button>
+</div>
diff --git a/app/frontend/templates/admin/events/reservations.html b/app/frontend/templates/admin/events/reservations.html
index 53e25a458..c44167264 100644
--- a/app/frontend/templates/admin/events/reservations.html
+++ b/app/frontend/templates/admin/events/reservations.html
@@ -55,7 +55,7 @@
               <button class="btn btn-default" ng-click="validateReservation(reservation)" ng-if="!isValidated(reservation) && !isCancelled(reservation)" translate>
                 {{ 'app.admin.event_reservations.validate' }}
               </button>
-              <button class="btn btn-default" ng-if="isValidated(reservation) && !isCancelled(reservation)" translate>
+              <button class="btn btn-default" ng-click="payReservation(reservation)" ng-if="isValidated(reservation) && !isCancelled(reservation)" translate>
                 {{ 'app.admin.event_reservations.pay' }}
               </button>
             </td>
diff --git a/app/frontend/templates/events/show.html b/app/frontend/templates/events/show.html
index 4d665f1e7..421ec4aa6 100644
--- a/app/frontend/templates/events/show.html
+++ b/app/frontend/templates/events/show.html
@@ -195,7 +195,7 @@
                   </div>
                 </div>
 
-                <div ng-show="currentUser.role == 'admin'" class="m-t">
+                <div ng-show="currentUser.role == 'admin' && !event.pre_registration" class="m-t">
                     <label for="offerSlot" class="control-label m-r" translate>{{ 'app.public.events_show.make_a_gift_of_this_reservation' }}</label>
                     <input bs-switch
                            ng-model="event.offered"
@@ -217,7 +217,10 @@
             <a class="pull-right m-t-xs text-u-l ng-scope" ng-click="cancelReserve($event)" ng-show="reserve.toReserve" translate>{{ 'app.shared.buttons.cancel' }}</a>
           </div>
 
-          <div ng-if="reserveSuccess" class="alert alert-success">{{ 'app.public.events_show.thank_you_your_payment_has_been_successfully_registered' | translate }}<br>
+          <div ng-if="reserveSuccess && !event.pre_registration" class="alert alert-success">{{ 'app.public.events_show.thank_you_your_payment_has_been_successfully_registered' | translate }}<br>
+            {{ 'app.public.events_show.you_can_find_your_reservation_s_details_on_your_' | translate }} <a ui-sref="app.logged.dashboard.invoices" translate>{{ 'app.public.events_show.dashboard' }}</a>
+          </div>
+          <div ng-if="reserveSuccess && event.pre_registration" class="alert alert-success">{{ 'app.public.events_show.thank_you_your_pre_registration_has_been_successfully_saved' | translate }}<br>
             {{ 'app.public.events_show.you_can_find_your_reservation_s_details_on_your_' | translate }} <a ui-sref="app.logged.dashboard.invoices" translate>{{ 'app.public.events_show.dashboard' }}</a>
           </div>
           <div class="m-t-sm" ng-if="reservations && !reserve.toReserve" ng-repeat="reservation in reservations">
@@ -257,7 +260,7 @@
             </p>
           </uib-alert>
 
-          <coupon show="reserve.totalSeats > 0 && ctrl.member" coupon="coupon.applied" total="reserve.totalNoCoupon" user-id="{{ctrl.member.id}}"></coupon>
+          <coupon show="reserve.totalSeats > 0 && ctrl.member && !event.pre_registration" coupon="coupon.applied" total="reserve.totalNoCoupon" user-id="{{ctrl.member.id}}"></coupon>
         </div>
       </div>
 
diff --git a/app/views/api/reservations/_reservation.json.jbuilder b/app/views/api/reservations/_reservation.json.jbuilder
index 78558e924..8e91cc028 100644
--- a/app/views/api/reservations/_reservation.json.jbuilder
+++ b/app/views/api/reservations/_reservation.json.jbuilder
@@ -8,6 +8,7 @@ json.slots_reservations_attributes reservation.slots_reservations do |sr|
   json.id sr.id
   json.canceled_at sr.canceled_at&.iso8601
   json.validated_at sr.validated_at&.iso8601
+  json.slot_id sr.slot_id
   json.slot_attributes do
     json.id sr.slot_id
     json.start_at sr.slot.start_at.iso8601
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index 1341e26a1..68aceeacd 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -651,6 +651,8 @@ en:
         do_you_really_want_to_validate_this_reservation_this_apply_to_all_booked_tickets: "Do you really want to validate this reservation? This apply to ALL booked tickets."
         reservation_was_successfully_validated: "Reservation was successfully validated."
         validation_failed: "Validation failed."
+        confirm_payment: "Confirm payment"
+        confirm_payment_of_html: "{ROLE, select, admin{Cash} other{Pay}}: {AMOUNT}" #(contexte : validate a payment of $20,00)
       events_settings:
         title: "Settings"
         generic_text_block: "Editorial text block"
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index bcd882cef..467002598 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -651,6 +651,8 @@ fr:
         do_you_really_want_to_validate_this_reservation_this_apply_to_all_booked_tickets: "Êtes vous sur de vouloir valider cette réservation? Ceci s'applique à TOUTES les places réservées."
         reservation_was_successfully_validated: "La réservation a bien été validé."
         validation_failed: "La validation a échoué."
+        confirm_payment: "Confirmer le paiement"
+        confirm_payment_of_html: "{ROLE, select, admin{Encaisser} other{Payer}} : {AMOUNT}" #(contexte : validate a payment of $20,00)
       events_settings:
         title: "Paramètres"
         generic_text_block: "Bloc de texte rédactionnel"
diff --git a/config/locales/app.public.en.yml b/config/locales/app.public.en.yml
index 5771815b7..21c7a0b25 100644
--- a/config/locales/app.public.en.yml
+++ b/config/locales/app.public.en.yml
@@ -330,6 +330,7 @@ en:
         ticket: "{NUMBER, plural, one{ticket} other{tickets}}"
         make_a_gift_of_this_reservation: "Make a gift of this reservation"
         thank_you_your_payment_has_been_successfully_registered: "Thank you. Your payment has been successfully registered!"
+        thank_you_your_pre_registration_has_been_successfully_saved: "Thank you. Your pre-registration has been successfully saved!"
         you_can_find_your_reservation_s_details_on_your_: "You can find your reservation's details on your"
         dashboard: "dashboard"
         you_booked_DATE: "You booked ({DATE}):"
diff --git a/config/locales/app.public.fr.yml b/config/locales/app.public.fr.yml
index 15f85a659..580a75f8a 100644
--- a/config/locales/app.public.fr.yml
+++ b/config/locales/app.public.fr.yml
@@ -330,6 +330,7 @@ fr:
         ticket: "{NUMBER, plural, =0{place} one{place} other{places}}"
         make_a_gift_of_this_reservation: "Offrir cette réservation"
         thank_you_your_payment_has_been_successfully_registered: "Merci. Votre paiement a bien été pris en compte !"
+        thank_you_your_pre_registration_has_been_successfully_saved: "Merci. Votre pré-inscription a bien été pris en compte !"
         you_can_find_your_reservation_s_details_on_your_: "Vous pouvez retrouver le détail de votre réservation sur votre"
         dashboard: "tableau de bord"
         you_booked_DATE: "Vous avez réservé ({DATE}) :"