Fix request

Model/AdyenInitiateTerminalApi.php

@@ -158,7 +158,7 @@ class AdyenInitiateTerminalApi implements AdyenInitiateTerminalApiInterface
         ];
 
         if (!empty($payload['number_of_installments'])) {
-            $request['SaleToPOIRequest']['PaymentData'] = [
+            $request['SaleToPOIRequest']['PaymentRequest']['PaymentData'] = [
                 "PaymentType" => "Instalment",
                 "Instalment" => [
                     "InstalmentType" => "EqualInstalments",

view/frontend/web/js/view/payment/method-renderer/adyen-pos-cloud-method.js

@@ -176,7 +176,7 @@ define(
              * @returns {boolean}
              */
             isButtonActive: function () {
-                return this.isActive() && this.getCode() == this.isChecked();
+                return this.isActive() && this.getCode() == this.isChecked() && this.getConnectedTerminals().length > 0 && this.validate();
             },
         });
     }