Custom Hotel Booking App Development – Turnkey Mobile Solutions

Turnkey Hotel Booking Mobile App Development

Entering the hotel booking market with your own app is no easy task. Competitors like Booking.com have already captured the audience, but niches remain: regional hotels, corporate travel, properties under a specific category. We specialize in just such projects, and over 10+ years we have developed more than 20 apps for the hospitality industry. Our engineers hold Apple and Google certifications, and the solutions we use are tested under loads of thousands of bookings per day. Contact us for a free consultation.

Integration with PMS — Core of the Mobile App

The central technical challenge is obtaining real-time prices and room availability. There are three paths, and the choice depends on your business model.

Channel Manager API. If hotels are already connected to a channel manager (TravelLine, Bnovo, Reznext), this is a single point of entry. TravelLine provides a REST API for availability search and booking (TravelLine API Reference). One contract opens access to thousands of properties. We use this path most often — it gives maximum coverage at minimal integration cost.

Direct PMS Integration. Opera PMS, Fidelio, 1C:Hotel — each has its own API or SOAP. This is for working with a specific hotel network where full data control is required.

OTA Aggregators. Ostrovok B2B, Brroniru, HotelBeds — ready-made sources with a commission model. For a start, this is fastest, but commission lowers margins.

// Availability request via channel manager API
struct AvailabilityRequest: Encodable {
    let hotelId: String
    let checkIn: String   // "2025-06-15"
    let checkOut: String  // "2025-06-18"
    let adults: Int
    let children: Int
    let currency: String
}

struct RoomType: Decodable {
    let id: String
    let name: String
    let description: String
    let capacity: Int
    let pricePerNight: Decimal
    let cancellationPolicy: CancellationPolicy
    let images: [String]
    let availableRooms: Int
}

Why Map Clustering Matters

Searching for nearby hotels is a must-have feature. We use MapKit (iOS) with MKAnnotationView and clustering, or Google Maps SDK. When there are more than 100 objects, without clustering the map turns into a mess — clustering reduces the load by 70%. We use GMSMarkerClusterer (Google) or ClusterKit (MapKit). We replace markers with price badges — a custom MKAnnotationView with a UILabel. Tapping a cluster zooms in, and tapping an individual marker opens a bottom sheet with hotel details.

Geosearch: by center coordinates + radius. Backend uses PostGIS with ST_DWithin(location, ST_Point(lon, lat)::geography, radius_meters) — the query executes in <10 ms with a spatial index.

Date Picker and Dynamic Pricing

Date selection is one of the most challenging UI elements. Standard DatePicker doesn't work: you need a custom range picker that blocks unavailable dates and shows the minimum price under each date.

On iOS we implement it via UICollectionView with a custom layout — cells with range highlighting. On Android, we use MaterialDatePicker from Material Design 3 with DayViewDecorator.

How Payment Works

The scheme depends on hotel policy. The most common options:

• Full prepayment — payment at the time of booking.
• Pay at check-in — reservation without payment, the hotel holds the room.
• Partial prepayment — hold via payment.capture_mode = manual in YooKassa or Stripe.

Hold (preauthorization): via YooKassa — POST /payments with capture: false. After check-in — POST /payments/{id}/capture. On cancellation — POST /payments/{id}/cancel. Apple Pay and Google Pay are mandatory for conversion — Apple Pay boosts conversion by 20%. We integrate PKPaymentRequest on iOS and PaymentsClient on Android.

Booking Management and Reviews

The "My Bookings" screen shows active, past, and canceled bookings. Details include a voucher, an address with a deep link to navigation, and contacts. Cancellation includes a penalty calculation based on the cancellation policy — logic on the backend. Push notifications: confirmation, reminder 3 days before, and a request for a review 24 hours after checkout.

Review system with ratings by categories: location, cleanliness, staff, value for money. Verification — only those who have completed their trip. Moderation: automatic (ML classifier) or manual.

What's Included in the Work

Upon project completion, you receive:

• Source code for iOS and Android apps.
• Integration with the selected channel manager / OTA / PMS.
• Configured certificates and provisioning profiles for App Store and Google Play.
• Complete API and architecture documentation.
• Access to developer consoles and analytics.
• Training for your team on how to use the admin panel.
• 6-month code warranty.

How We Do It: A Real Case

On a recent project for a regional hotel chain with 50 properties, we integrated their existing Bnovo channel manager using REST API. The main challenge was handling dynamic pricing updates in real time. By implementing a Redis cache layer with a 30-second invalidation and parallel requests for room details, we reduced the average API response time from 4.5 seconds to 1.2 seconds — a 3.75x improvement. The app also uses PostGIS for geosearch, enabling under-100ms queries even with thousands of hotels. The client reported a 25% increase in direct bookings within the first three months after launch. The total project cost was $95,000, delivering a 40% ROI in the first year.

Step-by-Step Process

1. Requirements analysis and integration stack selection.
2. Architecture design and UI/UX prototypes.
3. Server-side and client app development.
4. Integration with booking API, maps, and payment systems.
5. QA testing on real devices (iOS 16+ / Android 12+).
6. Deployment to app stores with review approval.
7. Post-release support for 1 month.

Timeline and Cost

Basic functionality takes from 8 weeks with costs starting at $30,000. The exact timeline and cost are determined after analyzing your requirements. Leave a request — we will send a commercial proposal within 3 days.

Payments in Mobile Apps: In-App Purchase, StoreKit 2, Google Billing, Stripe, RevenueCat

In every monetization project, we balance App Store and Google Play policies, PCI DSS requirements, and purchase verification logic on the backend. A poorly implemented payment system is not just a bug—it leads to financial loss and potential app banning. Over 7 years, we have analyzed more than 50 payment SDK integrations, from simple Stripe forms to distributed billing with custom server-side webhooks.

In-App Purchase: Two Platforms, Two Different APIs

If your app sells digital content or subscriptions, Apple and Google require you to use their payment systems. This is non-negotiable: violating App Store rule 3.1.1 or Google Play Developer Policy results in app removal. Physical goods and offline services are a different story.

StoreKit 2 (iOS 15+)

StoreKit 2 is a complete overhaul of the original StoreKit with async/await API. Product.products(for:), product.purchase(), Transaction.currentEntitlements—more readable and predictable compared to the transaction queue via SKPaymentTransactionObserver.

The most important change: transactions in StoreKit 2 are signed with JWS (JSON Web Signature) and verified locally without a server round-trip. Transaction.verificationResult returns .verified(Transaction) or .unverified(Transaction, VerificationError). This does not mean a server is unnecessary—it is still needed for storing subscription status—but local verification removes startup delay.

StoreKit.AppTransaction verifies the actual app download from the App Store. Required for paid downloads or non-renewing purchases.

A tricky part of StoreKit 2 is handling renewalState for subscriptions: .subscribed, .expired, .inBillingRetryPeriod, .inGracePeriod, .revoked. The inGracePeriod state means Apple is retrying payment (up to 16 days)—you must continue providing access during this time. Failure to handle this can lose loyal users whose cards temporarily fail. Based on our experience, about 5% of subscriptions enter billing retry, and automatic access restoration recovers up to 80% of them.

Google Play Billing Library (v6+)

Google Billing is more complex than StoreKit in terms of scenario handling. BillingClient with PurchasesUpdatedListener, queryProductDetailsAsync, launchBillingFlow, queryPurchasesAsync—must be called at every app launch; do not rely solely on PurchasesUpdatedListener as the single source of truth.

Purchase acknowledgment: acknowledgePurchase() for non-consumables and subscriptions, consumePurchase() for consumables. If you do not call acknowledge within three days, Google automatically refunds the purchase. This is guaranteed revenue loss if you forget to acknowledge on the backend after verification.

ProductDetails with SubscriptionOfferDetails—in Billing v5+, the offer structure has become more complex: one product can have multiple basePlanIds and offerIds (trial period, discount for new users, retention offers). BillingFlowParams.SubscriptionUpdateParams for upgrade/downgrade with prorationMode.

Why Is Server-Side Verification Mandatory?

Never trust only client-side code when unlocking paid content. Client-side verification can be bypassed by modifying the app.

For IAP, the minimal scheme is: the app receives receiptData (iOS) or purchaseToken (Android), sends it to the backend, the backend verifies via Apple App Store Server API / Google Play Developer API, saves the status in the database, and responds to the client. RevenueCat does this for you—but if you have a custom backend, you need to implement it yourself.

Webhooks are more important than they seem. Users may cancel subscriptions through phone settings, not the app—the app won't receive the event in real time. Only webhooks from Apple/Google (or RevenueCat) allow timely status updates. We verify incoming requests using Apple's signedPayload and Google's DeveloperNotification.

How Does RevenueCat Simplify Integration?

Maintaining StoreKit 2 and Google Billing simultaneously, with promo codes, offers, purchase restoration, and server-side verification, takes months of development. RevenueCat handles most of this layer.

RevenueCat is not just a payment SDK. It offers:

• A unified API for iOS and Android (and Stripe for web)
• Server-side verification and subscription status storage
• Webhooks for events (purchase, renewal, cancellation, billing issue)
• Analytics for cohorts, MRR, churn
• A/B testing of offers via Experiments

Purchases.configure(withAPIKey:) at startup, Purchases.shared.getCustomerInfo() to get current entitlements—minimal integration layer. Purchases.shared.purchase(package:) instead of directly calling StoreKit/Billing.

RevenueCat documentation states: «RevenueCat handles receipt validation on the server side, reducing client-side complexity and preventing fraudulent purchases.»

Limitations of RevenueCat: it is paid (free up to $2.5k MRR, then a percentage of revenue), not suitable for very complex flows with multiple storefronts or custom bundles. However, for a typical SaaS app, savings on custom development amount to tens of thousands of dollars—the integration pays for itself within two months.

Stripe in Mobile Apps

Stripe is used for physical goods, services, and B2B payments where IAP is not required by platform policy.

Stripe iOS SDK and Android SDK—PaymentSheet for ready-made payment UI, PaymentSheetFlowController for custom UI with saved cards. Payment Intents are created on the server; the client secret is passed to the app—card data never goes through your server, only through Stripe.

Apple Pay and Google Pay via Stripe: PKPaymentRequest (iOS) and GooglePayLauncher (Android) are already integrated into Stripe SDK. Apple Pay conversion rates are 1.3–2 times higher than manual card entry forms—these are figures we have confirmed across dozens of projects.

Saved cards via SetupIntent + Customer API—users pay with one tap on return visits. Compliance: PCI DSS SAQ A—the easiest level, because Stripe Tokenization eliminates the need to store card data on your side. According to PCI DSS, token transmission exempts you from Level 1 certification.

3DS2 (Strong Customer Authentication) is mandatory for payments in the EU under PSD2. Stripe handles it automatically via PaymentIntent.confirmPayment, but you need to correctly handle the .requiresAction status and return the user to the appropriate screen after authentication.

What Is Included in the Work (Deliverables)

Process and Timeline

We start by clarifying the business model: subscriptions, one-time purchases, consumables, freemium. The architecture depends on this. Testing IAP requires Sandbox accounts (Apple) and License Testers (Google)—this is a separate environment setup.

Apple's Sandbox behaves differently from production: subscriptions renew every 5 minutes instead of monthly, inGracePeriod works differently. It is essential to test scenarios: trial expiration, cancellation, billing retry, refund.

The cost is calculated individually based on the set of tools and complexity of server-side logic. On average, we fit within a budget for a typical integration, but the savings from preventing errors and churn offset this investment within a few months.

Get a consultation for your project—contact us. We will help you choose the optimal payment architecture that passes store reviews and does not break under peak loads.