diff --git a/src/AppStoreServerAPI.php b/src/AppStoreServerAPI.php
index af312eb..b080360 100644
--- a/src/AppStoreServerAPI.php
+++ b/src/AppStoreServerAPI.php
@@ -24,11 +24,13 @@
 use Readdle\AppStoreServerAPI\Request\MassExtendSubscriptionRenewalDateRequest;
 use Readdle\AppStoreServerAPI\Request\RequestTestNotificationRequest;
 use Readdle\AppStoreServerAPI\Request\SendConsumptionInformationRequest;
+use Readdle\AppStoreServerAPI\Request\SetAppAccountTokenRequest;
 use Readdle\AppStoreServerAPI\RequestBody\AbstractRequestBody;
 use Readdle\AppStoreServerAPI\RequestBody\ConsumptionRequestBody;
 use Readdle\AppStoreServerAPI\RequestBody\ExtendRenewalDateRequestBody;
 use Readdle\AppStoreServerAPI\RequestBody\MassExtendRenewalDateRequestBody;
 use Readdle\AppStoreServerAPI\RequestBody\NotificationHistoryRequestBody;
+use Readdle\AppStoreServerAPI\RequestBody\UpdateAppAccountTokenRequestBody;
 use Readdle\AppStoreServerAPI\RequestQueryParams\AbstractRequestQueryParams;
 use Readdle\AppStoreServerAPI\RequestQueryParams\GetAllSubscriptionStatusesQueryParams;
 use Readdle\AppStoreServerAPI\RequestQueryParams\GetNotificationHistoryQueryParams;
@@ -140,6 +142,17 @@ public function sendConsumptionInformation(string $transactionId, array $request
         );
     }
 
+    public function setAppAccountToken(string $transactionId, array $requestBody): void
+    {
+        $this->performRequest(
+            SetAppAccountTokenRequest::class,
+            null,
+            ['transactionId' => $transactionId],
+            null,
+            new UpdateAppAccountTokenRequestBody($requestBody)
+        );
+    }
+
     public function lookUpOrderId(string $orderId): OrderLookupResponse
     {
         /**
diff --git a/src/Request/SetAppAccountTokenRequest.php b/src/Request/SetAppAccountTokenRequest.php
new file mode 100644
index 0000000..1cc1443
--- /dev/null
+++ b/src/Request/SetAppAccountTokenRequest.php
@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace Readdle\AppStoreServerAPI\Request;
+
+final class SetAppAccountTokenRequest extends AbstractRequest
+{
+    public function getHTTPMethod(): string
+    {
+        return self::HTTP_METHOD_PUT;
+    }
+
+    protected function getURLPattern(): string
+    {
+        return '{baseUrl}/v1/transactions/{transactionId}/appAccountToken';
+    }
+}
diff --git a/src/RequestBody/UpdateAppAccountTokenRequestBody.php b/src/RequestBody/UpdateAppAccountTokenRequestBody.php
new file mode 100644
index 0000000..8a6a8e8
--- /dev/null
+++ b/src/RequestBody/UpdateAppAccountTokenRequestBody.php
@@ -0,0 +1,16 @@
+<?php
+declare(strict_types=1);
+
+namespace Readdle\AppStoreServerAPI\RequestBody;
+
+final class UpdateAppAccountTokenRequestBody extends AbstractRequestBody
+{
+    /**
+     * The UUID of the in-app user account that completed the consumable in-app purchase transaction.
+     */
+    protected string $appAccountToken;
+
+    protected array $requiredFields = [
+        'appAccountToken',
+    ];
+}