diff --git a/package-lock.json b/package-lock.json
index bfb4881..9a8c43f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "devDependencies": {
         "@prettier/plugin-php": "^0.24.0",
         "@seamapi/nextlove-sdk-generator": "^1.19.10",
-        "@seamapi/types": "1.805.0",
+        "@seamapi/types": "1.809.0",
         "del": "^7.1.0",
         "prettier": "^3.0.0"
       }
@@ -533,9 +533,9 @@
       }
     },
     "node_modules/@seamapi/types": {
-      "version": "1.805.0",
-      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.805.0.tgz",
-      "integrity": "sha512-G9STdKRht2qkUAp7jqQdH7U75N1UDUJspt/TnfRVaI0EO1GTWAjGd7NfVm28rsB8rkU9sN2M3fb6TBGUjfwfdA==",
+      "version": "1.809.0",
+      "resolved": "https://registry.npmjs.org/@seamapi/types/-/types-1.809.0.tgz",
+      "integrity": "sha512-xBrXorx5njf53vwoHSgEzXxL4Bul82kxKOzRVNs/K37VU4YcaLKQc1Q7ONuFPP/PfDSWP2pCOiRgzx99nrPiHQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index f9158d1..c5167ad 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "devDependencies": {
     "@prettier/plugin-php": "^0.24.0",
     "@seamapi/nextlove-sdk-generator": "^1.19.10",
-    "@seamapi/types": "1.805.0",
+    "@seamapi/types": "1.809.0",
     "del": "^7.1.0",
     "prettier": "^3.0.0"
   }
diff --git a/src/SeamClient.php b/src/SeamClient.php
index 43f1cbe..7674063 100644
--- a/src/SeamClient.php
+++ b/src/SeamClient.php
@@ -297,6 +297,7 @@ public function create_multiple(
         ?bool $prefer_native_scheduling = null,
         ?float $preferred_code_length = null,
         ?string $starts_at = null,
+        ?bool $use_backup_access_code_pool = null,
     ): array {
         $request_payload = [];
 
@@ -343,6 +344,11 @@ public function create_multiple(
         if ($starts_at !== null) {
             $request_payload["starts_at"] = $starts_at;
         }
+        if ($use_backup_access_code_pool !== null) {
+            $request_payload[
+                "use_backup_access_code_pool"
+            ] = $use_backup_access_code_pool;
+        }
 
         $res = $this->seam->request(
             "POST",