diff --git a/Model/ApiFacade/OpenApi.php b/Model/ApiFacade/OpenApi.php
index 8f380a6..87dec06 100755
--- a/Model/ApiFacade/OpenApi.php
+++ b/Model/ApiFacade/OpenApi.php
@@ -164,6 +164,10 @@ private function handleDataStructure(array $data): array
             $paymentData['pay']['channelId'] = $data['channel'];
         }
 
+        if ($data['tax_id']) {
+            $paymentData['payer']['taxId'] = $data['tax_id'];
+        }
+
         return $paymentData;
     }
 
diff --git a/Model/ApiFacade/Transaction/TransactionApiFacade.php b/Model/ApiFacade/Transaction/TransactionApiFacade.php
index 130631b..77d378c 100755
--- a/Model/ApiFacade/Transaction/TransactionApiFacade.php
+++ b/Model/ApiFacade/Transaction/TransactionApiFacade.php
@@ -118,6 +118,7 @@ public function originApiFieldCorrect(array $data): array
             unset($data['channel']);
             unset($data['currency']);
             unset($data['language']);
+            unset($data['tax_id']);
         }
 
         return $data;
diff --git a/Model/TpayPayment.php b/Model/TpayPayment.php
index 9685923..f1bc51d 100755
--- a/Model/TpayPayment.php
+++ b/Model/TpayPayment.php
@@ -198,6 +198,7 @@ public function getTpayFormData(?string $orderId = null): array
             'city' => $this->escaper->escapeHtml($order->getBillingAddress()->getData('city')),
             'zip' => $this->escaper->escapeHtml($order->getBillingAddress()->getData('postcode')),
             'country' => $this->escaper->escapeHtml($order->getBillingAddress()->getData('country_id')),
+            'tax_id' => $this->escaper->escapeHtml($order->getBillingAddress()->getData('vat_id')),
             'return_error_url' => $this->urlBuilder->getUrl('magento2basic/tpay/error'),
             'result_url' => $this->urlBuilder->getUrl('magento2basic/tpay/notification'),
             'return_url' => $this->urlBuilder->getUrl('magento2basic/tpay/success'),