diff --git a/plugins/woocommerce/includes/admin/class-wc-admin-importers.php b/plugins/woocommerce/includes/admin/class-wc-admin-importers.php
index 6dfec075b89..3c16a0b07d9 100644
--- a/plugins/woocommerce/includes/admin/class-wc-admin-importers.php
+++ b/plugins/woocommerce/includes/admin/class-wc-admin-importers.php
@@ -215,114 +215,12 @@ class WC_Admin_Importers {
 	 * Ajax callback for importing one batch of products from a CSV.
 	 */
 	public function do_ajax_product_import() {
-		global $wpdb;
-
-		check_ajax_referer( 'wc-product-import', 'security' );
-
-		if ( ! $this->import_allowed() || ! isset( $_POST['file'] ) ) { // PHPCS: input var ok.
+		if ( ! $this->import_allowed() ) {
 			wp_send_json_error( array( 'message' => __( 'Insufficient privileges to import products.', 'woocommerce' ) ) );
 		}
 
 		include_once WC_ABSPATH . 'includes/admin/importers/class-wc-product-csv-importer-controller.php';
-		include_once WC_ABSPATH . 'includes/import/class-wc-product-csv-importer.php';
-
-		$file   = wc_clean( wp_unslash( $_POST['file'] ) ); // PHPCS: input var ok.
-		$params = array(
-			'delimiter'          => ! empty( $_POST['delimiter'] ) ? wc_clean( wp_unslash( $_POST['delimiter'] ) ) : ',', // PHPCS: input var ok.
-			'start_pos'          => isset( $_POST['position'] ) ? absint( $_POST['position'] ) : 0, // PHPCS: input var ok.
-			'mapping'            => isset( $_POST['mapping'] ) ? (array) wc_clean( wp_unslash( $_POST['mapping'] ) ) : array(), // PHPCS: input var ok.
-			'update_existing'    => isset( $_POST['update_existing'] ) ? (bool) $_POST['update_existing'] : false, // PHPCS: input var ok.
-			'character_encoding' => isset( $_POST['character_encoding'] ) ? wc_clean( wp_unslash( $_POST['character_encoding'] ) ) : '',
-
-			/**
-			 * Batch size for the product import process.
-			 *
-			 * @param int $size Batch size.
-			 *
-			 * @since 3.1.0
-			 */
-			'lines'              => apply_filters( 'woocommerce_product_import_batch_size', 30 ),
-			'parse'              => true,
-		);
-
-		// Log failures.
-		if ( 0 !== $params['start_pos'] ) {
-			$error_log = array_filter( (array) get_user_option( 'product_import_error_log' ) );
-		} else {
-			$error_log = array();
-		}
-
-		$importer         = WC_Product_CSV_Importer_Controller::get_importer( $file, $params );
-		$results          = $importer->import();
-		$percent_complete = $importer->get_percent_complete();
-		$error_log        = array_merge( $error_log, $results['failed'], $results['skipped'] );
-
-		update_user_option( get_current_user_id(), 'product_import_error_log', $error_log );
-
-		if ( 100 === $percent_complete ) {
-			// @codingStandardsIgnoreStart.
-			$wpdb->delete( $wpdb->postmeta, array( 'meta_key' => '_original_id' ) );
-			$wpdb->delete( $wpdb->posts, array(
-				'post_type'   => 'product',
-				'post_status' => 'importing',
-			) );
-			$wpdb->delete( $wpdb->posts, array(
-				'post_type'   => 'product_variation',
-				'post_status' => 'importing',
-			) );
-			// @codingStandardsIgnoreEnd.
-
-			// Clean up orphaned data.
-			$wpdb->query(
-				"
-				DELETE {$wpdb->posts}.* FROM {$wpdb->posts}
-				LEFT JOIN {$wpdb->posts} wp ON wp.ID = {$wpdb->posts}.post_parent
-				WHERE wp.ID IS NULL AND {$wpdb->posts}.post_type = 'product_variation'
-			"
-			);
-			$wpdb->query(
-				"
-				DELETE {$wpdb->postmeta}.* FROM {$wpdb->postmeta}
-				LEFT JOIN {$wpdb->posts} wp ON wp.ID = {$wpdb->postmeta}.post_id
-				WHERE wp.ID IS NULL
-			"
-			);
-			// @codingStandardsIgnoreStart.
-			$wpdb->query( "
-				DELETE tr.* FROM {$wpdb->term_relationships} tr
-				LEFT JOIN {$wpdb->posts} wp ON wp.ID = tr.object_id
-				LEFT JOIN {$wpdb->term_taxonomy} tt ON tr.term_taxonomy_id = tt.term_taxonomy_id
-				WHERE wp.ID IS NULL
-				AND tt.taxonomy IN ( '" . implode( "','", array_map( 'esc_sql', get_object_taxonomies( 'product' ) ) ) . "' )
-			" );
-			// @codingStandardsIgnoreEnd.
-
-			// Send success.
-			wp_send_json_success(
-				array(
-					'position'            => 'done',
-					'percentage'          => 100,
-					'url'                 => add_query_arg( array( '_wpnonce' => wp_create_nonce( 'woocommerce-csv-importer' ) ), admin_url( 'edit.php?post_type=product&page=product_importer&step=done' ) ),
-					'imported'            => is_countable( $results['imported'] ) ? count( $results['imported'] ) : 0,
-					'imported_variations' => is_countable( $results['imported_variations'] ) ? count( $results['imported_variations'] ) : 0,
-					'failed'              => is_countable( $results['failed'] ) ? count( $results['failed'] ) : 0,
-					'updated'             => is_countable( $results['updated'] ) ? count( $results['updated'] ) : 0,
-					'skipped'             => is_countable( $results['skipped'] ) ? count( $results['skipped'] ) : 0,
-				)
-			);
-		} else {
-			wp_send_json_success(
-				array(
-					'position'            => $importer->get_file_position(),
-					'percentage'          => $percent_complete,
-					'imported'            => is_countable( $results['imported'] ) ? count( $results['imported'] ) : 0,
-					'imported_variations' => is_countable( $results['imported_variations'] ) ? count( $results['imported_variations'] ) : 0,
-					'failed'              => is_countable( $results['failed'] ) ? count( $results['failed'] ) : 0,
-					'updated'             => is_countable( $results['updated'] ) ? count( $results['updated'] ) : 0,
-					'skipped'             => is_countable( $results['skipped'] ) ? count( $results['skipped'] ) : 0,
-				)
-			);
-		}
+		WC_Product_CSV_Importer_Controller::dispatch_ajax();
 	}
 
 	/**
diff --git a/plugins/woocommerce/includes/admin/importers/class-wc-product-csv-importer-controller.php b/plugins/woocommerce/includes/admin/importers/class-wc-product-csv-importer-controller.php
index e5fac1cecb9..87b705e9ef3 100644
--- a/plugins/woocommerce/includes/admin/importers/class-wc-product-csv-importer-controller.php
+++ b/plugins/woocommerce/includes/admin/importers/class-wc-product-csv-importer-controller.php
@@ -274,6 +274,121 @@ class WC_Product_CSV_Importer_Controller {
 		$this->output_footer();
 	}
 
+	/**
+	 * Processes AJAX requests related to a product CSV import.
+	 *
+	 * @since 9.3.0
+	 */
+	public static function dispatch_ajax() {
+		global $wpdb;
+
+		check_ajax_referer( 'wc-product-import', 'security' );
+
+		try {
+			$file = wc_clean( wp_unslash( $_POST['file'] ?? '' ) ); // PHPCS: input var ok.
+			$params = array(
+				'delimiter'          => ! empty( $_POST['delimiter'] ) ? wc_clean( wp_unslash( $_POST['delimiter'] ) ) : ',', // PHPCS: input var ok.
+				'start_pos'          => isset( $_POST['position'] ) ? absint( $_POST['position'] ) : 0, // PHPCS: input var ok.
+				'mapping'            => isset( $_POST['mapping'] ) ? (array) wc_clean( wp_unslash( $_POST['mapping'] ) ) : array(), // PHPCS: input var ok.
+				'update_existing'    => isset( $_POST['update_existing'] ) ? (bool) $_POST['update_existing'] : false, // PHPCS: input var ok.
+				'character_encoding' => isset( $_POST['character_encoding'] ) ? wc_clean( wp_unslash( $_POST['character_encoding'] ) ) : '',
+
+				/**
+				 * Batch size for the product import process.
+				 *
+				 * @param int $size Batch size.
+				 *
+				 * @since 3.1.0
+				 */
+				'lines'              => apply_filters( 'woocommerce_product_import_batch_size', 1 ),
+				'parse'              => true,
+			);
+
+			// Log failures.
+			if ( 0 !== $params['start_pos'] ) {
+				$error_log = array_filter( (array) get_user_option( 'product_import_error_log' ) );
+			} else {
+				$error_log = array();
+			}
+
+			include_once WC_ABSPATH . 'includes/import/class-wc-product-csv-importer.php';
+
+			$importer         = self::get_importer( $file, $params );
+			$results          = $importer->import();
+			$percent_complete = $importer->get_percent_complete();
+			$error_log        = array_merge( $error_log, $results['failed'], $results['skipped'] );
+
+			update_user_option( get_current_user_id(), 'product_import_error_log', $error_log );
+
+			if ( 100 === $percent_complete ) {
+				// @codingStandardsIgnoreStart.
+				$wpdb->delete( $wpdb->postmeta, array( 'meta_key' => '_original_id' ) );
+				$wpdb->delete( $wpdb->posts, array(
+					'post_type'   => 'product',
+					'post_status' => 'importing',
+				) );
+				$wpdb->delete( $wpdb->posts, array(
+					'post_type'   => 'product_variation',
+					'post_status' => 'importing',
+				) );
+				// @codingStandardsIgnoreEnd.
+
+				// Clean up orphaned data.
+				$wpdb->query(
+					"
+					DELETE {$wpdb->posts}.* FROM {$wpdb->posts}
+					LEFT JOIN {$wpdb->posts} wp ON wp.ID = {$wpdb->posts}.post_parent
+					WHERE wp.ID IS NULL AND {$wpdb->posts}.post_type = 'product_variation'
+				"
+				);
+				$wpdb->query(
+					"
+					DELETE {$wpdb->postmeta}.* FROM {$wpdb->postmeta}
+					LEFT JOIN {$wpdb->posts} wp ON wp.ID = {$wpdb->postmeta}.post_id
+					WHERE wp.ID IS NULL
+				"
+				);
+				// @codingStandardsIgnoreStart.
+				$wpdb->query( "
+					DELETE tr.* FROM {$wpdb->term_relationships} tr
+					LEFT JOIN {$wpdb->posts} wp ON wp.ID = tr.object_id
+					LEFT JOIN {$wpdb->term_taxonomy} tt ON tr.term_taxonomy_id = tt.term_taxonomy_id
+					WHERE wp.ID IS NULL
+					AND tt.taxonomy IN ( '" . implode( "','", array_map( 'esc_sql', get_object_taxonomies( 'product' ) ) ) . "' )
+				" );
+				// @codingStandardsIgnoreEnd.
+
+				// Send success.
+				wp_send_json_success(
+					array(
+						'position'            => 'done',
+						'percentage'          => 100,
+						'url'                 => add_query_arg( array( '_wpnonce' => wp_create_nonce( 'woocommerce-csv-importer' ) ), admin_url( 'edit.php?post_type=product&page=product_importer&step=done' ) ),
+						'imported'            => is_countable( $results['imported'] ) ? count( $results['imported'] ) : 0,
+						'imported_variations' => is_countable( $results['imported_variations'] ) ? count( $results['imported_variations'] ) : 0,
+						'failed'              => is_countable( $results['failed'] ) ? count( $results['failed'] ) : 0,
+						'updated'             => is_countable( $results['updated'] ) ? count( $results['updated'] ) : 0,
+						'skipped'             => is_countable( $results['skipped'] ) ? count( $results['skipped'] ) : 0,
+					)
+				);
+			} else {
+				wp_send_json_success(
+					array(
+						'position'            => $importer->get_file_position(),
+						'percentage'          => $percent_complete,
+						'imported'            => is_countable( $results['imported'] ) ? count( $results['imported'] ) : 0,
+						'imported_variations' => is_countable( $results['imported_variations'] ) ? count( $results['imported_variations'] ) : 0,
+						'failed'              => is_countable( $results['failed'] ) ? count( $results['failed'] ) : 0,
+						'updated'             => is_countable( $results['updated'] ) ? count( $results['updated'] ) : 0,
+						'skipped'             => is_countable( $results['skipped'] ) ? count( $results['skipped'] ) : 0,
+					)
+				);
+			}
+		} catch ( \Exception $e ) {
+			wp_send_json_error( array( 'message' => $e->getMessage() ) );
+		}
+	}
+
 	/**
 	 * Output information about the uploading process.
 	 */