diff --git a/examples/firebase/index.js b/examples/firebase/index.js
index e3abb49..7567f38 100644
--- a/examples/firebase/index.js
+++ b/examples/firebase/index.js
@@ -1,28 +1,29 @@
 const functions = require("firebase-functions");
 const admin = require("firebase-admin");
 const { PKPass } = require("passkit-generator");
-var fs = require("node:fs");
-var path = require("node:path");
-var axios = require("axios");
-var os = require("node:os");
+const fs = require("node:fs");
+const path = require("node:path");
+const axios = require("axios");
+const os = require("node:os");
 
 // Firebase init
 admin.initializeApp({
 	credential: admin.credential.cert(require("CERTIFICATE_PATH")),
 	storageBucket: "STORAGE_BUCKET_URL",
 });
-var storageRef = admin.storage().bucket();
 
-exports.pass = functions.https.onRequest((request, response) => {
-	PKPass.from(
+const storageRef = admin.storage().bucket();
+
+exports.pass = functions.https.onRequest(async (request, response) => {
+	const newPass = await PKPass.from(
 		{
 			// Get relevant pass model from model folder (see passkit-generator/examples/models/)
 			model: `./model/${request.body.passType}.pass`,
 			certificates: {
 				// Assigning certificates from certs folder (you will need to provide these yourself)
-				wwdr: fs.fs.readFileSync("./certs/wwdr.pem"),
-				signerCert: fs.fs.readFileSync("./certs/signerCert.pem"),
-				signerKey: fs.fs.readFileSync("./certs/signerKey.pem"),
+				wwdr: fs.readFileSync("./certs/wwdr.pem"),
+				signerCert: fs.readFileSync("./certs/signerCert.pem"),
+				signerKey: fs.readFileSync("./certs/signerKey.pem"),
 				signerKeyPassphrase: "PASSPHRASE",
 			},
 		},
@@ -34,171 +35,171 @@ exports.pass = functions.https.onRequest((request, response) => {
 			backgroundColor: request.body.backgroundColor,
 			labelColor: request.body.labelColor,
 		},
-	).then(async (newPass) => {
-		let currentPassType = request.body.passType;
+	);
 
-		if (currentPassType == "boardingPass") {
-			newPass.transitType = `PKTransitType${request.body.transitType}`;
-		}
+	let currentPassType = request.body.passType;
 
-		if (request.body.relevantDate !== "Blank") {
-			newPass.setRelevantDate(new Date(request.body.relevantDate));
-		}
+	if (currentPassType == "boardingPass") {
+		newPass.transitType = `PKTransitType${request.body.transitType}`;
+	}
 
-		if (request.body.expiryDate !== "Blank") {
-			newPass.setExpirationDate(new Date(request.body.expiryDate));
-		}
+	if (request.body.relevantDate !== "Blank") {
+		newPass.setRelevantDate(new Date(request.body.relevantDate));
+	}
 
-		if (
-			request.body.relevantLocationLat !== "Blank" &&
-			request.body.relevantLocationLong !== "Blank"
-		) {
-			newPass.setLocations({
-				latitude: request.body.relevantLocationLat,
-				longitude: request.body.relevantLocationLong,
+	if (request.body.expiryDate !== "Blank") {
+		newPass.setExpirationDate(new Date(request.body.expiryDate));
+	}
+
+	if (
+		request.body.relevantLocationLat !== "Blank" &&
+		request.body.relevantLocationLong !== "Blank"
+	) {
+		newPass.setLocations({
+			latitude: request.body.relevantLocationLat,
+			longitude: request.body.relevantLocationLong,
+		});
+	}
+
+	request.body.header.forEach((field, index) => {
+		if (field.label !== "" || field.value !== "") {
+			newPass.headerFields.push({
+				key: `header${index}`,
+				label: field.label,
+				value: field.value,
 			});
 		}
+	});
 
-		request.body.header.forEach((field, index) => {
-			if (field.label !== "" || field.value !== "") {
-				newPass.headerFields.push({
-					key: `header${index}`,
-					label: field.label,
-					value: field.value,
-				});
-			}
-		});
-
-		request.body.primary.forEach((field, index) => {
-			if (field.label !== "" || field.value !== "") {
-				newPass.primaryFields.push({
-					key: `primary${index}`,
-					label: field.label,
-					value:
-						currentPassType == "boardingPass"
-							? field.value.toUpperCase()
-							: field.value,
-				});
-			}
-		});
-
-		request.body.secondary.forEach((field, index) => {
-			if (field.label !== "" || field.value !== "") {
-				newPass.secondaryFields.push({
-					key: `secondary${index}`,
-					label: field.label,
-					value: field.value,
-					textAlignment:
-						index === request.body.secondary.length - 2 ||
-						index === request.body.secondary.length - 1
-							? "PKTextAlignmentRight"
-							: "PKTextAlignmentLeft",
-				});
-			}
-		});
-
-		request.body.auxiliary.forEach((field, index) => {
-			if (field.label !== "" || field.value !== "") {
-				newPass.auxiliaryFields.push({
-					key: `auxiliary${index}`,
-					label: field.label,
-					value: field.value,
-					textAlignment:
-						index === request.body.secondary.length - 2 ||
-						index === request.body.secondary.length - 1
-							? "PKTextAlignmentRight"
-							: "PKTextAlignmentLeft",
-				});
-			}
-		});
-
-		if (!request.body.codeAlt || request.body.codeAlt.trim() === "") {
-			newPass.setBarcodes({
-				message: request.body.qrText,
-				format: `PKBarcodeFormat${request.body.codeType}`,
-				messageEncoding: "iso-8859-1",
-			});
-		} else {
-			newPass.setBarcodes({
-				message: request.body.qrText,
-				format: `PKBarcodeFormat${request.body.codeType}`,
-				messageEncoding: "iso-8859-1",
-				altText: request.body.codeAlt,
+	request.body.primary.forEach((field, index) => {
+		if (field.label !== "" || field.value !== "") {
+			newPass.primaryFields.push({
+				key: `primary${index}`,
+				label: field.label,
+				value:
+					currentPassType == "boardingPass"
+						? field.value.toUpperCase()
+						: field.value,
 			});
 		}
+	});
 
-		// Downloading thumbnail and logo files from Firebase Storage and adding to pass
-		if (currentPassType == "generic" || currentPassType == "eventTicket") {
-			const thumbnailFile = request.body.thumbnailFile;
-			const tempPath1 = path.join(os.tmpdir(), thumbnailFile);
-			try {
-				await storageRef
-					.file(`thumbnails/${thumbnailFile}`)
-					.download({ destination: tempPath1 });
-			} catch (error) {
-				console.error(error);
-			}
-			let buffer = Buffer.alloc(0);
-			try {
-				buffer = fs.readFileSync(tempPath1);
-			} catch (error) {
-				console.error(error);
-			}
-			newPass.addBuffer("thumbnail.png", buffer);
-			newPass.addBuffer("thumbnail@2x.png", buffer);
+	request.body.secondary.forEach((field, index) => {
+		if (field.label !== "" || field.value !== "") {
+			newPass.secondaryFields.push({
+				key: `secondary${index}`,
+				label: field.label,
+				value: field.value,
+				textAlignment:
+					index === request.body.secondary.length - 2 ||
+					index === request.body.secondary.length - 1
+						? "PKTextAlignmentRight"
+						: "PKTextAlignmentLeft",
+			});
 		}
+	});
 
-		const logoFile = request.body.logoFile;
-		const tempPath2 = path.join(os.tmpdir(), logoFile);
+	request.body.auxiliary.forEach((field, index) => {
+		if (field.label !== "" || field.value !== "") {
+			newPass.auxiliaryFields.push({
+				key: `auxiliary${index}`,
+				label: field.label,
+				value: field.value,
+				textAlignment:
+					index === request.body.secondary.length - 2 ||
+					index === request.body.secondary.length - 1
+						? "PKTextAlignmentRight"
+						: "PKTextAlignmentLeft",
+			});
+		}
+	});
+
+	if (!request.body.codeAlt || request.body.codeAlt.trim() === "") {
+		newPass.setBarcodes({
+			message: request.body.qrText,
+			format: `PKBarcodeFormat${request.body.codeType}`,
+			messageEncoding: "iso-8859-1",
+		});
+	} else {
+		newPass.setBarcodes({
+			message: request.body.qrText,
+			format: `PKBarcodeFormat${request.body.codeType}`,
+			messageEncoding: "iso-8859-1",
+			altText: request.body.codeAlt,
+		});
+	}
+
+	// Downloading thumbnail and logo files from Firebase Storage and adding to pass
+	if (currentPassType == "generic" || currentPassType == "eventTicket") {
+		const thumbnailFile = request.body.thumbnailFile;
+		const tempPath1 = path.join(os.tmpdir(), thumbnailFile);
 		try {
 			await storageRef
-				.file(`logos/${logoFile}`)
-				.download({ destination: tempPath2 });
+				.file(`thumbnails/${thumbnailFile}`)
+				.download({ destination: tempPath1 });
 		} catch (error) {
 			console.error(error);
 		}
 		let buffer = Buffer.alloc(0);
 		try {
-			buffer = fs.readFileSync(tempPath2);
+			buffer = fs.readFileSync(tempPath1);
 		} catch (error) {
 			console.error(error);
 		}
-		newPass.addBuffer("logo.png", buffer);
-		newPass.addBuffer("logo@2x.png", buffer);
+		newPass.addBuffer("thumbnail.png", buffer);
+		newPass.addBuffer("thumbnail@2x.png", buffer);
+	}
 
-		const bufferData = newPass.getAsBuffer();
-		try {
-			console.log("Pass was uploaded successfully.");
-			response.set("Content-Type", newPass.mimeType);
-			response.status(200).send(bufferData);
+	const logoFile = request.body.logoFile;
+	const tempPath2 = path.join(os.tmpdir(), logoFile);
+	try {
+		await storageRef
+			.file(`logos/${logoFile}`)
+			.download({ destination: tempPath2 });
+	} catch (error) {
+		console.error(error);
+	}
+	let buffer = Buffer.alloc(0);
+	try {
+		buffer = fs.readFileSync(tempPath2);
+	} catch (error) {
+		console.error(error);
+	}
+	newPass.addBuffer("logo.png", buffer);
+	newPass.addBuffer("logo@2x.png", buffer);
 
-			// Delete thumbnail file in Firebase Storage
-			storageRef
-				.file(`thumbnails/${thumbnailFile}`)
-				.delete()
-				.then(() => {
-					console.log("Thumbnail file deleted successfully");
-				})
-				.catch((error) => {
-					console.error(error);
-				});
+	const bufferData = newPass.getAsBuffer();
+	try {
+		console.log("Pass was uploaded successfully.");
+		response.set("Content-Type", newPass.mimeType);
+		response.status(200).send(bufferData);
 
-			// Delete logo file in Firebase Storage
-			storageRef
-				.file(`logos/${logoFile}`)
-				.delete()
-				.then(() => {
-					console.log("Logo file deleted successfully");
-				})
-				.catch((error) => {
-					console.error(error);
-				});
-		} catch (error) {
-			console.log("Error Uploading pass " + error);
-			response.send({
-				explanation: error.message,
-				result: "FAILED",
+		// Delete thumbnail file in Firebase Storage
+		storageRef
+			.file(`thumbnails/${thumbnailFile}`)
+			.delete()
+			.then(() => {
+				console.log("Thumbnail file deleted successfully");
+			})
+			.catch((error) => {
+				console.error(error);
 			});
-		}
-	});
+
+		// Delete logo file in Firebase Storage
+		storageRef
+			.file(`logos/${logoFile}`)
+			.delete()
+			.then(() => {
+				console.log("Logo file deleted successfully");
+			})
+			.catch((error) => {
+				console.error(error);
+			});
+	} catch (error) {
+		console.log("Error Uploading pass " + error);
+		response.send({
+			explanation: error.message,
+			result: "FAILED",
+		});
+	}
 });