diff --git a/VERSION.md b/VERSION.md
index 513572f..db95fa3 100644
--- a/VERSION.md
+++ b/VERSION.md
@@ -1,8 +1,4 @@
-4.3.0
+4.4.0
 ## Added
-- Added Carta Porte / Comercio Exterior constants classes:
-  - `CustomsRegimes`, `CveTransporteEnum`, `TipoEstacionEnum`, `PermisoSctEnum`, `SectorCofeprisEnum`
-  - `PharmaceuticalFormsEnum`, `SpecialConditionsEnum`, `MaterialTypeEnum`, `TypeOfCustomsDocumentEnum`
-  - `TransportTypeEnum`, `TransportFigureEnum`, `RegistroIstmoEnum`, `LoadingKey`, `ConfigMaritimaEnum`
-  - `RailTrafficTypeEnum`, `ContainerTypeEnum`, `MaritimeContainerTypeEnum`, `RailCarTypeEnum`, `RailServiceTypeEnum`
-  - `MotivoTrasladoEnum`, `IncotermEnum`, `UnidadAduanaEnum`
+- Added `Receipts->toInvoice(array $data)` to call `POST /receipts/multi-invoice`.
+- Added `Receipts->previewToInvoicePdf(array $data)` to call `POST /receipts/multi-invoice/preview/pdf`.
diff --git a/src/Resources/Receipts.php b/src/Resources/Receipts.php
index 06b7dc3..626b554 100644
--- a/src/Resources/Receipts.php
+++ b/src/Resources/Receipts.php
@@ -5,7 +5,8 @@
 use Facturapi\Http\BaseClient;
 use Facturapi\Exceptions\FacturapiException;
 
-class Receipts extends BaseClient {
+class Receipts extends BaseClient
+{
 	protected string $ENDPOINT = 'receipts';
 
 
@@ -17,10 +18,11 @@ class Receipts extends BaseClient {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function all( $params = null ): mixed {
+	public function all($params = null): mixed
+	{
 		try {
-			return json_decode( $this->executeGetRequest( $this->getRequestUrl( $params ) ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeGetRequest($this->getRequestUrl($params)));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -33,10 +35,11 @@ public function all( $params = null ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function retrieve( $id ): mixed {
+	public function retrieve($id): mixed
+	{
 		try {
-			return json_decode( $this->executeGetRequest( $this->getRequestUrl( $id ) ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeGetRequest($this->getRequestUrl($id)));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -49,10 +52,11 @@ public function retrieve( $id ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function create( $params ): mixed {
+	public function create($params): mixed
+	{
 		try {
-			return json_decode( $this->executeJsonPostRequest( $this->getRequestUrl(), $params ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeJsonPostRequest($this->getRequestUrl(), $params));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -67,10 +71,11 @@ public function create( $params ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function invoice( $id, $params ): mixed {
+	public function invoice($id, $params): mixed
+	{
 		try {
-			return json_decode( $this->executeJsonPostRequest( $this->getRequestUrl( $id ) . "/invoice", $params ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeJsonPostRequest($this->getRequestUrl($id) . "/invoice", $params));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -83,14 +88,51 @@ public function invoice( $id, $params ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function createGlobalInvoice( $params ): mixed {
+	public function createGlobalInvoice($params): mixed
+	{
 		try {
-			return json_decode( $this->executeJsonPostRequest( $this->getRequestUrl() . "/global-invoice", $params ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeJsonPostRequest($this->getRequestUrl() . "/global-invoice", $params));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
 
+	/**
+	 * Creates a single invoice using a list of receipt keys
+	 *
+	 * @param $data Array of properties and property values for creating an invoice from multiple receipts
+	 *
+	 * @return Response The created invoice object or preview summary when dry_run is enabled
+	 *
+	 * @throws FacturapiException
+	 */
+	public function toInvoice($data)
+	{
+		try {
+			return json_decode($this->executeJsonPostRequest($this->getRequestUrl() . "/to-invoice", $data));
+		} catch (FacturapiException $e) {
+			throw new FacturapiException('Unable to create invoice: ' . $e->getMessage());
+		}
+	}
+
+	/**
+	 * Generates an invoice PDF preview for multiple receipts without stamping or saving it
+	 *
+	 * @param $data Array of properties and property values for generating an invoice PDF preview
+	 *
+	 * @return string PDF file contents
+	 *
+	 * @throws Facturapi_Exception
+	 */
+	public function previewToInvoicePdf($data)
+	{
+		try {
+			return $this->executeJsonPostRequest($this->getRequestUrl() . "/to-invoice/preview", $data);
+		} catch (FacturapiException $e) {
+			throw new FacturapiException('Unable to generate invoice PDF preview: ' . $e->getMessage());
+		}
+	}
+
 	/**
 	 * Cancel a Receipt
 	 *
@@ -99,10 +141,11 @@ public function createGlobalInvoice( $params ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function cancel( $id ): mixed {
+	public function cancel($id): mixed
+	{
 		try {
-			return json_decode( $this->executeDeleteRequest( $this->getRequestUrl( $id ), null ) );
-		} catch ( FacturapiException $e ) {
+			return json_decode($this->executeDeleteRequest($this->getRequestUrl($id), null));
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -116,13 +159,14 @@ public function cancel( $id ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function sendByEmail( $id, $email = null ): mixed {
+	public function sendByEmail($id, $email = null): mixed
+	{
 		try {
-			return json_decode( $this->executeJsonPostRequest(
+			return json_decode($this->executeJsonPostRequest(
 				$this->getRequestUrl($id) . "/email",
 				$email == null ? null : array("email" => $email)
 			));
-		} catch ( FacturapiException $e ) {
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -130,9 +174,10 @@ public function sendByEmail( $id, $email = null ): mixed {
 	/**
 	 * @deprecated Use sendByEmail() instead. Will be removed in v5.
 	 */
-	public function send_by_email( $id, $email = null ): mixed {
+	public function send_by_email($id, $email = null): mixed
+	{
 		trigger_error('Receipts::send_by_email() is deprecated and will be removed in v5. Use sendByEmail() instead.', E_USER_DEPRECATED);
-		return $this->sendByEmail( $id, $email );
+		return $this->sendByEmail($id, $email);
 	}
 
 	/**
@@ -143,10 +188,11 @@ public function send_by_email( $id, $email = null ): mixed {
 	 *
 	 * @throws FacturapiException
 	 */
-	public function downloadPdf( $id ): string {
+	public function downloadPdf($id): string
+	{
 		try {
-			return $this->executeGetRequest( $this->getRequestUrl( $id ) . "/pdf" );
-		} catch ( FacturapiException $e ) {
+			return $this->executeGetRequest($this->getRequestUrl($id) . "/pdf");
+		} catch (FacturapiException $e) {
 			throw $e;
 		}
 	}
@@ -154,8 +200,9 @@ public function downloadPdf( $id ): string {
 	/**
 	 * @deprecated Use downloadPdf() instead. Will be removed in v5.
 	 */
-	public function download_pdf( $id ): string {
+	public function download_pdf($id): string
+	{
 		trigger_error('Receipts::download_pdf() is deprecated and will be removed in v5. Use downloadPdf() instead.', E_USER_DEPRECATED);
-		return $this->downloadPdf( $id );
+		return $this->downloadPdf($id);
 	}
 }