diff --git a/inc/Loader/Git.php b/inc/Loader/Git.php
index 796fadf..cb90316 100644
--- a/inc/Loader/Git.php
+++ b/inc/Loader/Git.php
@@ -51,8 +51,9 @@ public function download(): ?string {
 		 * @since 4.0.0
 		 *
 		 * @param string $branch Name of the Git branch to clone. Empty string clones the default branch.
+		 * @param \Required\Traduttore\Repository $repository Full repository instance.
 		 */
-		$branch = apply_filters( 'traduttore.git_clone_branch', '' );
+		$branch = apply_filters( 'traduttore.git_clone_branch', '', $this->repository );
 		if ( '' !== $branch ) {
 			$cmd .= ' --branch ' . escapeshellarg( $branch );
 		}
diff --git a/inc/WebhookHandler/Base.php b/inc/WebhookHandler/Base.php
index f59f339..2a79c15 100644
--- a/inc/WebhookHandler/Base.php
+++ b/inc/WebhookHandler/Base.php
@@ -8,8 +8,10 @@
 namespace Required\Traduttore\WebhookHandler;
 
 use Required\Traduttore\Project;
+use Required\Traduttore\ProjectLocator;
 use Required\Traduttore\WebhookHandler;
 use WP_REST_Request;
+use WP_REST_Response;
 
 /**
  * Base webhook handler class.
@@ -85,4 +87,34 @@ protected function get_secret( ?Project $project = null ): ?string {
 		 */
 		return apply_filters( 'traduttore.webhook_secret', $secret, $this, $project );
 	}
+
+	/**
+	 * Return a valid project or errors. Allows to customize the pulled branch.
+	 *
+	 * @param string $repository Metadata to find a GlotPress project.
+	 * @param string $default_branch Name of the repository's default branch.
+	 * @param string $ref Name of the received branch through the webhook.
+	 * @return \Required\Traduttore\Project|\WP_REST_Response|\WP_Error
+	 */
+	protected function resolve_project( string $repository, string $default_branch = '', string $ref = '' ): Project|WP_REST_Response|\WP_Error {
+		$locator = new ProjectLocator( $repository );
+		$project = $locator->get_project();
+
+		if ( ! $project ) {
+			return new \WP_Error( '404', 'Could not find project for this repository', [ 'status' => 404 ] );
+		}
+
+		if ( empty( $default_branch ) || empty( $ref ) ) {
+			return $project;
+		}
+
+		$branch = 'refs/heads/' . (string) apply_filters( 'traduttore.git_clone_branch', $default_branch, $project->get_repository_name() );
+
+		// We only care about the default or custom branch but don't want to send an error still.
+		if ( $branch !== $ref ) {
+			return new WP_REST_Response( [ 'result' => 'Not the default or custom branch' ] );
+		}
+
+		return $project;
+	}
 }
diff --git a/inc/WebhookHandler/Bitbucket.php b/inc/WebhookHandler/Bitbucket.php
index 45011ec..d45573b 100644
--- a/inc/WebhookHandler/Bitbucket.php
+++ b/inc/WebhookHandler/Bitbucket.php
@@ -7,6 +7,7 @@
 
 namespace Required\Traduttore\WebhookHandler;
 
+use Required\Traduttore\Project;
 use Required\Traduttore\ProjectLocator;
 use Required\Traduttore\Repository;
 use Required\Traduttore\Updater;
@@ -79,12 +80,12 @@ public function callback(): \WP_Error|\WP_REST_Response {
 		 * @var array{repository: array{scm: string, full_name: string, links: array{html: array{href: string}}, is_private: bool}} $params
 		 */
 		$params = $this->request->get_params();
+		$href   = (string) $params['repository']['links']['html']['href'];
 
-		$locator = new ProjectLocator( $params['repository']['links']['html']['href'] );
-		$project = $locator->get_project();
+		$project = $this->resolve_project( $href );
 
-		if ( ! $project ) {
-			return new \WP_Error( '404', 'Could not find project for this repository' );
+		if ( ! $project instanceof Project ) {
+			return $project;
 		}
 
 		if ( ! $project->get_repository_vcs_type() ) {
@@ -92,7 +93,7 @@ public function callback(): \WP_Error|\WP_REST_Response {
 		}
 
 		$project->set_repository_name( $params['repository']['full_name'] );
-		$project->set_repository_url( $params['repository']['links']['html']['href'] );
+		$project->set_repository_url( $href );
 
 		$ssh_url   = sprintf( 'git@bitbucket.org:%s.git', $project->get_repository_name() );
 		$https_url = sprintf( 'https://bitbucket.org/%s.git', $project->get_repository_name() );
diff --git a/inc/WebhookHandler/GitHub.php b/inc/WebhookHandler/GitHub.php
index 7df5dcc..bd7f1d6 100644
--- a/inc/WebhookHandler/GitHub.php
+++ b/inc/WebhookHandler/GitHub.php
@@ -7,6 +7,7 @@
 
 namespace Required\Traduttore\WebhookHandler;
 
+use Required\Traduttore\Project;
 use Required\Traduttore\ProjectLocator;
 use Required\Traduttore\Repository;
 use Required\Traduttore\Updater;
@@ -117,24 +118,25 @@ public function callback(): \WP_Error|\WP_REST_Response {
 		 * @var array{repository: array{ default_branch?: string, html_url: string, full_name: string, ssh_url: string, clone_url: string, private: bool }, ref: string } $params
 		 */
 
-		if ( ! isset( $params['repository']['default_branch'] ) ) {
-			return new \WP_Error( '400', 'Request incomplete', [ 'status' => 400 ] );
-		}
+		$default_branch = (string) ( $params['repository']['default_branch'] ?? '' );
+		$html_url       = (string) $params['repository']['html_url'];
+		$ref            = (string) $params['ref'];
 
-		// We only care about the default branch but don't want to send an error still.
-		if ( 'refs/heads/' . $params['repository']['default_branch'] !== $params['ref'] ) {
-			return new WP_REST_Response( [ 'result' => 'Not the default branch' ] );
+		if ( '' === $default_branch
+			| '' === $html_url
+			| '' === $ref
+		) {
+			return new \WP_Error( '400', 'Request incomplete', [ 'status' => 400 ] );
 		}
 
-		$locator = new ProjectLocator( $params['repository']['html_url'] );
-		$project = $locator->get_project();
+		$project = $this->resolve_project( $html_url, $default_branch, $ref );
 
-		if ( ! $project ) {
-			return new \WP_Error( '404', 'Could not find project for this repository', [ 'status' => 404 ] );
+		if ( ! $project instanceof Project ) {
+			return $project;
 		}
 
 		$project->set_repository_name( $params['repository']['full_name'] );
-		$project->set_repository_url( $params['repository']['html_url'] );
+		$project->set_repository_url( $html_url );
 		$project->set_repository_ssh_url( $params['repository']['ssh_url'] );
 		$project->set_repository_https_url( $params['repository']['clone_url'] );
 		$project->set_repository_visibility( false === $params['repository']['private'] ? 'public' : 'private' );
diff --git a/inc/WebhookHandler/GitLab.php b/inc/WebhookHandler/GitLab.php
index 065d60c..1b12846 100644
--- a/inc/WebhookHandler/GitLab.php
+++ b/inc/WebhookHandler/GitLab.php
@@ -7,6 +7,7 @@
 
 namespace Required\Traduttore\WebhookHandler;
 
+use Required\Traduttore\Project;
 use Required\Traduttore\ProjectLocator;
 use Required\Traduttore\Repository;
 use Required\Traduttore\Updater;
@@ -77,22 +78,26 @@ public function callback(): \WP_Error|\WP_REST_Response {
 		 *
 		 * @var array{project: array{default_branch: string, homepage: string, path_with_namespace: string, ssh_url: string, http_url: string, visibility_level: int}, ref: string} $params
 		 */
-		$params = $this->request->get_params();
-
-		// We only care about the default branch but don't want to send an error still.
-		if ( 'refs/heads/' . $params['project']['default_branch'] !== $params['ref'] ) {
-			return new WP_REST_Response( [ 'result' => 'Not the default branch' ] );
+		$params         = $this->request->get_params();
+		$default_branch = (string) $params['project']['default_branch'];
+		$homepage       = (string) $params['project']['homepage'];
+		$ref            = (string) $params['ref'];
+
+		if ( '' === $default_branch
+			| '' === $homepage
+			| '' === $ref
+		) {
+			return new \WP_Error( '400', 'Request incomplete', [ 'status' => 400 ] );
 		}
 
-		$locator = new ProjectLocator( $params['project']['homepage'] );
-		$project = $locator->get_project();
+		$project = $this->resolve_project( $homepage, $default_branch, $ref );
 
-		if ( ! $project ) {
-			return new \WP_Error( '404', 'Could not find project for this repository' );
+		if ( ! $project instanceof Project ) {
+			return $project;
 		}
 
 		$project->set_repository_name( $params['project']['path_with_namespace'] );
-		$project->set_repository_url( $params['project']['homepage'] );
+		$project->set_repository_url( $homepage );
 		$project->set_repository_ssh_url( $params['project']['ssh_url'] );
 		$project->set_repository_https_url( $params['project']['http_url'] );
 		$project->set_repository_visibility( 20 === $params['project']['visibility_level'] ? 'public' : 'private' );
diff --git a/tests/phpunit/tests/WebhookHandler/GitHub.php b/tests/phpunit/tests/WebhookHandler/GitHub.php
index f7dc835..551864a 100644
--- a/tests/phpunit/tests/WebhookHandler/GitHub.php
+++ b/tests/phpunit/tests/WebhookHandler/GitHub.php
@@ -96,7 +96,7 @@ public function test_invalid_branch(): void {
 		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertSame( 200, $response->get_status() );
-		$this->assertSame( [ 'result' => 'Not the default branch' ], $response->get_data() );
+		$this->assertSame( [ 'result' => 'Not the default or custom branch' ], $response->get_data() );
 	}
 
 	public function test_invalid_project(): void {
diff --git a/tests/phpunit/tests/WebhookHandler/GitLab.php b/tests/phpunit/tests/WebhookHandler/GitLab.php
index 19597df..8007b83 100644
--- a/tests/phpunit/tests/WebhookHandler/GitLab.php
+++ b/tests/phpunit/tests/WebhookHandler/GitLab.php
@@ -81,7 +81,7 @@ public function test_invalid_branch(): void {
 		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertSame( 200, $response->get_status() );
-		$this->assertSame( [ 'result' => 'Not the default branch' ], $response->get_data() );
+		$this->assertSame( [ 'result' => 'Not the default or custom branch' ], $response->get_data() );
 	}
 
 	public function test_invalid_project(): void {
@@ -106,6 +106,28 @@ public function test_invalid_project(): void {
 		$this->assertErrorResponse( 404, $response );
 	}
 
+	public function test_request_incomplete(): void {
+		$request = new WP_REST_Request( 'POST', '/traduttore/v1/incoming-webhook' );
+		$request->set_body_params(
+			[
+				'ref'     => '',
+				'project' => [
+					'default_branch'      => 'master',
+					'path_with_namespace' => 'wearerequired/traduttore',
+					'homepage'            => 'https://gitlab.com/wearerequired/traduttore',
+					'http_url'            => 'https://gitlab.com/wearerequired/traduttore.git',
+					'ssh_url'             => 'git@gitlab.com/wearerequired/traduttore.git',
+					'visibility_level'    => 20,
+				],
+			]
+		);
+		$request->add_header( 'x-gitlab-event', 'Push Hook' );
+		$request->add_header( 'x-gitlab-token', 'traduttore-test' );
+		$response = rest_get_server()->dispatch( $request );
+
+		$this->assertErrorResponse( 400, $response );
+	}
+
 	public function test_valid_project(): void {
 		$request = new WP_REST_Request( 'POST', '/traduttore/v1/incoming-webhook' );
 		$request->set_body_params(
diff --git a/tests/phpunit/tests/WebhookHandler/LegacyGitHub.php b/tests/phpunit/tests/WebhookHandler/LegacyGitHub.php
index f18d72d..922021a 100644
--- a/tests/phpunit/tests/WebhookHandler/LegacyGitHub.php
+++ b/tests/phpunit/tests/WebhookHandler/LegacyGitHub.php
@@ -93,7 +93,7 @@ public function test_invalid_branch(): void {
 		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertSame( 200, $response->get_status() );
-		$this->assertSame( [ 'result' => 'Not the default branch' ], $response->get_data() );
+		$this->assertSame( [ 'result' => 'Not the default or custom branch' ], $response->get_data() );
 	}
 
 	public function test_invalid_project(): void {