diff --git a/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php b/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
index 823caf611..b91eca8a0 100644
--- a/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
+++ b/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
@@ -56,14 +56,14 @@ class PayUponInvoiceHelper {
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Missing
-		$billing_country = wc_clean( wp_unslash( $_POST['country'] ?? '' ) );
-		if ( $billing_country && 'DE' !== $billing_country ) {
+		$billing_country = WC()->customer->get_billing_country();
+		if ( empty( $billing_country ) || 'DE' !== $billing_country ) {
 			return false;
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Missing
-		$shipping_country = wc_clean( wp_unslash( $_POST['s_country'] ?? '' ) );
-		if ( $shipping_country && 'DE' !== $shipping_country ) {
+		$shipping_country = WC()->customer->get_shipping_country();
+		if ( empty( $shipping_country ) || 'DE' !== $shipping_country ) {
 			return false;
 		}