diff --git a/server/cypress/e2e/api/apple/[passTypeIdentifier].cy.ts b/server/cypress/e2e/api/apple/[passTypeIdentifier].cy.ts
index 9805fc9..2577fb5 100644
--- a/server/cypress/e2e/api/apple/[passTypeIdentifier].cy.ts
+++ b/server/cypress/e2e/api/apple/[passTypeIdentifier].cy.ts
@@ -11,21 +11,10 @@ describe('Get the List of Updatable Passes', () => {
     })
   })
 
-  it('error when missing passesUpdatedSince parameter', () => {
-    cy.request({
-      method: 'GET',
-      url: '/api/apple/v1/devices/b33e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3',
-      failOnStatusCode: false
-    }).then((response) => {
-      expect(response.status).to.eq(400)
-      expect(JSON.stringify(response.body)).to.contain('Missing/empty parameter: passesUpdatedSince')
-    })
-  })
-
   it('204 when unknown deviceLibraryIdentifier', () => {
     cy.request({
       method: 'GET',
-      url: '/api/apple/v1/devices/b00e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3?passesUpdatedSince={previousLastUpdated}',
+      url: '/api/apple/v1/devices/b00e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3',
       failOnStatusCode: false
     }).then((response) => {
       expect(response.status).to.eq(204)
@@ -35,13 +24,13 @@ describe('Get the List of Updatable Passes', () => {
   it('200 when existing deviceLibraryIdentifier', () => {
     cy.request({
       method: 'GET',
-      url: '/api/apple/v1/devices/b33e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3?passesUpdatedSince={previousLastUpdated}',
+      url: '/api/apple/v1/devices/b33e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3',
       failOnStatusCode: false
     }).then((response) => {
       expect(response.status).to.eq(200)
       expect(JSON.stringify(response.body)).to.contain('serialNumbers')
       expect(JSON.stringify(response.body)).to.contain('lastUpdated')
-      // TODO: verify serial number values
+      // TODO: verify serial number value(s)
     })
   })
 })
diff --git a/server/cypress/e2e/api/apple/[serialNumber].cy.ts b/server/cypress/e2e/api/apple/[serialNumber].cy.ts
index 2731151..3073b78 100644
--- a/server/cypress/e2e/api/apple/[serialNumber].cy.ts
+++ b/server/cypress/e2e/api/apple/[serialNumber].cy.ts
@@ -70,7 +70,7 @@ describe('Register a Pass for Update Notifications', () => {
   })
 
   it('success when deviceLibraryIdentifier is not already registered', () => {
-    const randomDeviceLibraryIdentifier : string = crypto.randomBytes(32).toString('hex')
+    const randomDeviceLibraryIdentifier : string = 'cypress_' + crypto.randomBytes(16).toString('hex')
     cy.request({
       method: 'POST',
       url: '/api/apple/v1/devices/' + randomDeviceLibraryIdentifier + '/registrations/pass.org.passport.nation3/333',
diff --git a/server/pages/api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier].ts b/server/pages/api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier].ts
index 0d6bf13..a7787b2 100644
--- a/server/pages/api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier].ts
+++ b/server/pages/api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier].ts
@@ -9,8 +9,8 @@ export default function handler(req: NextApiRequest, res: NextApiResponse) {
   console.log('[passTypeIdentifier].ts')
 
   // Expected URL format:
-  //   /api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier]?passesUpdatedSince=[passesUpdatedSince]
-  //   /api/apple/v1/devices/b33e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3?passesUpdatedSince=0
+  //   /api/apple/v1/devices/[deviceLibraryIdentifier]/registrations/[passTypeIdentifier]
+  //   /api/apple/v1/devices/b33e3a3dccb3030333e3333da33333a3/registrations/pass.org.passport.nation3
   console.log('req.url:', req.url)
 
   try {
@@ -26,15 +26,11 @@ export default function handler(req: NextApiRequest, res: NextApiResponse) {
     console.log('deviceLibraryIdentifier:', deviceLibraryIdentifier)
     console.log('passesUpdatedSince:', passesUpdatedSince)
 
-    // Validate the passesUpdatedSince parameter
-    if (!passesUpdatedSince || String(passesUpdatedSince).trim().length == 0) {
-      throw new Error('Missing/empty parameter: passesUpdatedSince')
-    } 
-
     // Lookup the serial numbers for the given device
     supabase
         .from('registrations')
-        .select('serial_number').eq('device_library_identifier', deviceLibraryIdentifier)
+        .select('serial_number')
+        .eq('device_library_identifier', deviceLibraryIdentifier)
         .then((result: any) => {
           console.log('result:', result)
           if (result.error) {
@@ -57,7 +53,7 @@ export default function handler(req: NextApiRequest, res: NextApiResponse) {
               // Return matching passes (serial numbers)
               res.status(200).json({
                 serialNumbers: serialNumbers,
-                lastUpdated: 0 // TODO
+                lastUpdated: 'TODO'
               })
             }
           }