diff --git a/src/Controller/Admin/AdvertController.php b/src/Controller/Admin/AdvertController.php
index 80c5677..ed901ce 100644
--- a/src/Controller/Admin/AdvertController.php
+++ b/src/Controller/Admin/AdvertController.php
@@ -311,6 +311,19 @@ class AdvertController extends AbstractController
         $amountFormatted = number_format((float) $amount, 2, '.', '');
         $payment = new \App\Entity\AdvertPayment($advert, \App\Entity\AdvertPayment::TYPE_SUCCESS, $amountFormatted);
         $payment->setMethod($method);
+
+        // Lier a un echeancier si methode = echeancier
+        if ('echeancier' === $method) {
+            $echeancierId = $request->request->getInt('echeancierId');
+            if ($echeancierId > 0) {
+                $echeancier = $this->em->getRepository(\App\Entity\Echeancier::class)->find($echeancierId);
+                if (null !== $echeancier) {
+                    $payment->setEcheancier($echeancier);
+                    $methodLabel = 'Echeancier #'.$echeancier->getId().' - '.$echeancier->getDescription();
+                }
+            }
+        }
+
         $this->em->persist($payment);
 
         // Tracker l'evenement
diff --git a/src/Entity/AdvertPayment.php b/src/Entity/AdvertPayment.php
index f6a37ae..6998efe 100644
--- a/src/Entity/AdvertPayment.php
+++ b/src/Entity/AdvertPayment.php
@@ -30,6 +30,10 @@ class AdvertPayment
     #[ORM\Column(length: 30, nullable: true)]
     private ?string $method = null;
 
+    #[ORM\ManyToOne(targetEntity: \App\Entity\Echeancier::class)]
+    #[ORM\JoinColumn(nullable: true, onDelete: 'SET NULL')]
+    private ?\App\Entity\Echeancier $echeancier = null;
+
     #[ORM\Column]
     private \DateTimeImmutable $createdAt;
 
@@ -73,6 +77,18 @@ class AdvertPayment
         return $this;
     }
 
+    public function getEcheancier(): ?\App\Entity\Echeancier
+    {
+        return $this->echeancier;
+    }
+
+    public function setEcheancier(?\App\Entity\Echeancier $echeancier): static
+    {
+        $this->echeancier = $echeancier;
+
+        return $this;
+    }
+
     public function getCreatedAt(): \DateTimeImmutable
     {
         return $this->createdAt;
diff --git a/templates/admin/clients/show.html.twig b/templates/admin/clients/show.html.twig
index b21475f..c94a562 100644
--- a/templates/admin/clients/show.html.twig
+++ b/templates/admin/clients/show.html.twig
@@ -712,14 +712,24 @@
                                 </div>
                                 <div>
                                     <label for="mp-method-{{ a.id }}" class="block text-[9px] font-bold uppercase tracking-wider text-gray-400 mb-1">Methode de paiement</label>
-                                    <select id="mp-method-{{ a.id }}" name="method" required class="input-glass w-full px-3 py-2 text-xs font-bold">
+                                    <select id="mp-method-{{ a.id }}" name="method" required class="input-glass w-full px-3 py-2 text-xs font-bold" onchange="document.getElementById('mp-echeancier-wrap-{{ a.id }}').classList.toggle('hidden', this.value !== 'echeancier')">
                                         <option value="virement">Virement bancaire</option>
                                         <option value="cheque">Cheque</option>
                                         <option value="especes">Especes</option>
                                         <option value="cb_externe">CB (terminal externe)</option>
+                                        <option value="echeancier">Echeancier</option>
                                         <option value="autre">Autre</option>
                                     </select>
                                 </div>
+                                <div id="mp-echeancier-wrap-{{ a.id }}" class="hidden">
+                                    <label for="mp-echeancier-{{ a.id }}" class="block text-[9px] font-bold uppercase tracking-wider text-gray-400 mb-1">Echeancier lie</label>
+                                    <select id="mp-echeancier-{{ a.id }}" name="echeancierId" class="input-glass w-full px-3 py-2 text-xs font-bold">
+                                        <option value="">— Selectionner —</option>
+                                        {% for ech in echeancierList %}
+                                            <option value="{{ ech.id }}">{{ ech.description|length > 40 ? ech.description[:40] ~ '...' : ech.description }} ({{ ech.nbPaid }}/{{ ech.nbLines }} - {{ ech.totalAmountHt }} &euro;)</option>
+                                        {% endfor %}
+                                    </select>
+                                </div>
                                 <div>
                                     <label for="mp-reference-{{ a.id }}" class="block text-[9px] font-bold uppercase tracking-wider text-gray-400 mb-1">Reference (optionnel)</label>
                                     <input type="text" id="mp-reference-{{ a.id }}" name="reference" placeholder="N de virement, n de cheque..." class="input-glass w-full px-3 py-2 text-xs font-bold">