diff --git a/Puc/v4p2/Vcs/GitLabApi.php b/Puc/v4p2/Vcs/GitLabApi.php
index b8952d0..be3de09 100644
--- a/Puc/v4p2/Vcs/GitLabApi.php
+++ b/Puc/v4p2/Vcs/GitLabApi.php
@@ -50,8 +50,7 @@ if ( ! class_exists( 'Puc_v4p2_Vcs_GitLabApi', false ) ) :
 		 * @return Puc_v4p2_Vcs_Reference|null
 		 */
 		public function getLatestRelease() {
-			// GitLab doesn't use releases like GitHub, we should instead look through the tags for the latest one
-			// tagged as a release.
+			return $this->getLatestTag();
 		}
 
 		/**
@@ -71,24 +70,63 @@ if ( ! class_exists( 'Puc_v4p2_Vcs_GitLabApi', false ) ) :
 			}
 
 			$tag = $versionTags[0];
-			return new Puc_v4p2_Vcs_Reference( array (
+			return new Puc_v4p2_Vcs_Reference( array(
 				'name' => $tag->name,
 				'version' => ltrim( $tag->name, 'v' ),
-				'downloadUrl' => '',
+				'downloadUrl' => $this->buildArchiveDownloadUrl( $tag->name ),
 				'apiResponse' => $tag
 			) );
 		}
 
+		/**
+		 * Get a branch by name.
+		 *
+		 * @param string $branchName
+		 * @return null|Puc_v4p2_Vcs_Reference
+		 */
 		public function getBranch( $branchName ) {
-			// todo
+			$branch = $this->api( '/:user/:repo/repository/branches/' . $branchName );
+			if ( is_wp_error( $branch ) || empty( $branch ) ) {
+				return null;
+			}
+
+			$reference = new Puc_v4p2_Vcs_Reference( array(
+				'name' => $branch->name,
+				'downloadUrl' => $this->buildArchiveDownloadUrl( $branch->name ),
+				'apiResponse' => $branch,
+			) );
+
+			if ( isset ( $branch->commit, $branch->commit->committed_date ) ) {
+				$reference->updated = $branch->commit->committed_date;
+			}
+
+			return $reference;
 		}
 
+		/**
+		 * Get the latest commit that changed the specified file.
+		 *
+		 * @param string $filename
+		 * @param string $ref Reference name (e.g. branch or tag).
+		 * @return StdClass|null
+		 */
 		public function getLatestCommit( $filename, $ref = 'master' ) {
-			// todo
+			throw new LogicException( 'The ' . __METHOD__ . ' method is not implemented and should not be used.' );
 		}
 
+		/**
+		 * Get the timestamp of the latest commit that changed the specified branch or tag.
+		 *
+		 * @param string $ref Reference name (e.g. branch or tag).
+		 * @return string|null
+		 */
 		public function getLatestCommitTime( $ref ) {
-			// todo
+			$commits = $this->api( '/:user/:repo/repository/commits/', array( 'ref_name' => $ref ) );
+			if ( is_wp_error( $commits ) || ! is_array( $commits ) || ! isset( $commits[0] ) ) {
+				return null;
+			}
+
+			return $commits[0]->committed_date;
 		}
 
 		/**
@@ -154,6 +192,13 @@ if ( ! class_exists( 'Puc_v4p2_Vcs_GitLabApi', false ) ) :
 			return $url;
 		}
 
+		/**
+		 * Get the contents of a file from a specific branch or tag.
+		 *
+		 * @param string $path File name.
+		 * @param string $ref
+		 * @return null|string Either the contents of the file, or null if the file doesn't exist or there's an error.
+		 */
 		public function getRemoteFile( $path, $ref = 'master' ) {
 			$response = $this->api( '/:user/:repo/repository/files/' . $path, array( 'ref' => $ref ) );
 			if ( is_wp_error( $response ) || ! isset( $response->content ) || $response->encoding !== 'base64' ) {
@@ -163,18 +208,49 @@ if ( ! class_exists( 'Puc_v4p2_Vcs_GitLabApi', false ) ) :
 			return base64_decode( $response->content );
 		}
 
-		public function getTag( $tagName ) {
-			// todo
+		/**
+		 * Generate a URL to download a ZIP archive of the specified branch/tag/etc.
+		 *
+		 * @param string $ref
+		 * @return string
+		 */
+		public function buildArchiveDownloadUrl( $ref = 'master' ) {
+			$url = sprintf(
+				'https://%1$s/%2$s/%3$s/repository/%4$s/archive.zip',
+				$this->repositoryHost,
+				urlencode( $this->userName ),
+				urlencode( $this->repositoryName ),
+				urlencode( $ref ) );
+
+			if ( $this->accessToken ) {
+				$url = add_query_arg( 'private_token', $this->accessToken, $url );
+			}
+
+			return $url;
 		}
 
+		/**
+		 * Get a specific tag.
+		 *
+		 * @param string $tagName
+		 * @return Puc_v4p2_Vcs_Reference|null
+		 */
+		public function getTag( $tagName ) {
+			throw new LogicException( 'The ' . __METHOD__ . ' method is not implemented and should not be used.' );
+		}
+
+		/**
+		 * Figure out which reference (i.e tag or branch) contains the latest version.
+		 *
+		 * @param string $configBranch Start looking in this branch.
+		 * @return null|Puc_v4p2_Vcs_Reference
+		 */
 		public function chooseReference( $configBranch ) {
 			$updateSource = null;
 
+			// GitLab doesn't handle releases the same as GitHub so just use the latest tag
 			if ( $configBranch === 'master' ) {
-				// $updateSource = $this->getLatestRelease();
-				// if ( $updateSource === null ) {
 				$updateSource = $this->getLatestTag();
-				// }
 			}
 
 			if ( empty( $updateSource ) ) {
@@ -188,10 +264,6 @@ if ( ! class_exists( 'Puc_v4p2_Vcs_GitLabApi', false ) ) :
 			parent::setAuthentication( $credentials );
 			$this->accessToken = is_string( $credentials ) ? $credentials : null;
 		}
-
-		private function getDownloadUrl( $file ) {
-			// todo
-		}
 	}
 
 endif;
\ No newline at end of file