Upload 4 files

app.json

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+{
+  "expo": {
+    "name": "server",
+    "slug": "server",
+    "version": "1.0.0",
+    "description": "",
+    "sdkVersion": "49.0.0",
+    "platforms": [
+      "ios",
+      "android",
+      "web"
+    ]
+  }
+}

index.js

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+const path = require('path');
+const fs = require('fs');
+const crypto = require('crypto');
+const fastify = require('fastify')(
+	{
+	  logger: true,
+	  bodyLimit: 15 * 1048576,
+	}
+);
+const { PKPass } = require('passkit-generator');
+
+// Certificates
+const certDirectory = path.resolve(process.cwd(), 'cert');
+const wwdr = fs.readFileSync(path.join(certDirectory, 'wwdr.pem'));
+const signerCert = fs.readFileSync(path.join(certDirectory, 'signerCert.pem'));
+const signerKey = fs.readFileSync(path.join(certDirectory, 'signerKey.key'));
+
+fastify.post('/', async (request, reply) => {
+  const {
+    name,
+    cardNr,
+    dateFrom,
+    dateTo,
+    dateBirth,
+    aztecCode,
+    type,
+    image
+  } = request.body;
+
+  const passID = crypto.createHash('md5').update(`${name}_${Date.now()}`).digest('hex')
+
+
+// Generate the pass
+const pass = await PKPass.from(
+  {
+	// Path to your pass model directory
+    model: path.resolve(process.cwd(), 'transit.pass'),  
+    certificates: {
+      wwdr,
+      signerCert,
+      signerKey,
+    },
+  },
+  {
+    serialNumber: passID,
+  },
+);
+
+// MARK: add Infos to the pass
+// Barcode Type
+const barcode = {
+  format: "PKBarcodeFormatAztec",
+  message: aztecCode,
+  messageEncoding: "iso-8859-1"
+};
+
+// Barcode Data
+pass.setBarcodes(barcode);
+
+// Expiration Format
+const [day, month, year] = dateTo.split('.');
+const date = new Date(`${year}-${month}-${day}T23:59:00+01:00`);
+
+// Expiration Date
+pass.setExpirationDate(date);
+
+// headerFields
+pass.headerFields.push(
+    {
+      key: 'type',
+      value: type
+    }
+);
+
+// primaryFields
+pass.primaryFields.push(
+	{
+	  key: 'name',
+	  value: name
+	}
+);
+
+// secondaryFields
+pass.secondaryFields.push(
+	{
+	  key: 'cardNr',
+	  label: "Kartennummer",
+	  value: cardNr
+	},
+	{
+	  key: 'dateTo',
+	  label: "Ablaufdatum",
+	  value: dateTo
+	},
+);
+
+// auxiliaryFields
+pass.auxiliaryFields.push(
+    {
+      key: 'dateBirth',
+      label: "Geburtsdatum",
+      value: dateBirth
+    },
+    {
+      key: 'dateFrom',
+      label: "Beginn",
+      value: dateFrom
+    }
+);
+
+// Add a Image to the pass
+// Decode the image from Base64 and save or use it directly
+const imageBuffer = Buffer.from(image, "base64");
+    
+// Now you can use the image in your PKPass
+pass.addBuffer("thumbnail.png", imageBuffer);
+pass.addBuffer("thumbnail@2x.png", imageBuffer);
+
+reply.header('Content-Type', 'application/vnd-apple.pkpass');
+reply.send(pass.getAsBuffer());
+});
+
+// Start the server
+fastify.listen({ port: process.env.PORT ?? 3000, host: '0.0.0.0' }, function (err) {
+  if (err) {
+    fastify.log.error(err);
+    process.exit(1);
+  }
+  fastify.log.info(`Server listening on ${fastify.server.address().port}`);
+});

package.json

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+{
+  "name": "server",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "fastify": "^4.24.3",
+    "passkit-generator": "^3.1.11",
+    "react-native-wallet-manager": "^0.0.5"
+  }
+}