What Is an eCommerce Application?
eCommerce (electronic commerce) is online retail over the internet: a buyer purchases products or services from a virtual storefront (the seller). An e-commerce app (e-commerce application) is software that powers an online store with a product catalog, payment processing, and fulfillment or delivery.
What is m-Commerce (Mobile eCommerce)?
m-commerce (mobile commerce) is eCommerce built for phones and tablets, which are native shopping apps or mobile web stores. Some mobile apps add useful features such as augmented reality for virtual try-on and serve as marketing surfaces through product placement and push notifications.
Transactions in eCommerce are typically business-to-consumer (B2C) on sites like Amazon or eBay, consumer-to-consumer (C2C) on online marketplaces like Etsy, or business-to-business (B2B) on platforms like Alibaba. Many stores run on e-commerce platforms such as Shopify or WooCommerce and optimize for the buyer–seller relationship.
Essential eCommerce app features
While there are different e-commerce applications suited for specific customers, they all share common features that support and define their ecosystem:
Product listings: descriptions, images, prices, availability, categories, and search.
Shopping cart: add and review items before checkout.
Payment processing: cards, digital wallets, bank transfers, and secure payment gateways (e.g., PayPal).
User accounts: registration, login, profiles, order history, wish lists, personalized recommendations, and loyalty programs.
Order management and order tracking: returns and customer inquiries.
Notifications: push notifications for order status, conversations with sellers, promotions, and new products.
Seller rating: customer reviews and ratings.
Shipping and delivery options: methods, costs, delivery times, and tracking.
Returns: product returns and refund handling.
Customer support: live chat, chatbots, email, or phone—often tied to CRM tools.
Analytics and reporting: sales, customer behavior, inventory, and big data pipelines.
How to implement eCommerce features
Shipping these features across web, mobile, and warehouse systems is not a matter of wiring each one in isolation. Notifications, live order status, inventory counts, and buyer–seller chat only work when every channel reads the same state within seconds of a change.
Luckily, PubNub has everything you need to build real-time interactive apps, drive innovation, and deliver engaging user experiences that drive retention and growth. Thousands of customers with a variety of use cases depend on us to deliver messages in less than 100ms globally, process two trillion+ transactions per month, and back production workloads with a 99.999% uptime SLA, with peak concurrency references on the order of 10.5 million+ concurrent users for large online events. That means you can update your entire eCommerce platform with low-latent sync worldwide across web storefronts, iOS and Android apps, and backend services—with the scalability ecommerce platforms need as SKU count and channel count grow.
How PubNub integrates with eCommerce Apps
Whether you build your infrastructure in-house or use a managed real-time platform like PubNub, you'll need to ensure your platform can scale worldwide with low-latency delivery and sync:
Name Your Channels by Listing and Transaction: Map chat threads to listing IDs or order IDs so history, moderation, and analytics stay tied to the commerce object.
Tokenize Access: Buyer-seller channels need least-privilege, short-lived credentials, and the ability to revoke instantly so a client cannot read unrelated conversations or admin-only moderation feeds.
Implement Secure and Compliant Infrastructure: GDPR, CCPA, and marketplace-specific rules like the INFORM Act mean you need a zero-trust model in which every connection, user, and device is verified so message data does not leak across buyer-seller pairs.
Handle Disconnects and Traffic Spikes: Flash sales, holiday campaigns, and viral listings spike concurrent threads. Ensure your platform scales dynamically, balances load by region, and lets users who reconnect catch up on offers and shipping updates they missed.
Reserve Stock With Presence and Signals: The moment a buyer adds the last unit to the cart, mark it reserved for that user across sales channels. Use Signals for lightweight, high-frequency updates using cart heartbeats and live counter ticks, without incurring the full message payload cost on every call.
Notify Users Offline or in the Background: Push notifications for offers, new messages, counteroffers, and shipping milestones bring buyers and sellers back when the moment still matters.
Handle on the Edge: Inspecting messages before delivery or route for auditing purposes allows you to flag “text me on WhatsApp,” external payment links, or other off-platform patterns without spending money on a separate infrastructure.
Integrating with Third Party Vendors: Payments (Stripe Connect, Adyen, PayPal), CRM and helpdesk tools, trust vendors, and machine learning moderation services should plug into the same real-time workflow so you can enrich, route, or block without adding latency at peak.
Integrating with Your OMS, WMS, and Marketplaces: PubNub does not replace your order management system (OMS) or warehouse management system (WMS), but rather enhances it. Your OMS or WMS publishes stock changes, notifying storefronts, mobile apps, and connectors for Shopify, WooCommerce, and other online marketplaces—integrated by capturing events on the edge so order fulfillment and inventory tracking stay in sync without re-architecting your entire back end.
Ensure your LiveOps Team is Prepared: Trust and safety needs live visibility: who is active on a listing, which threads triggered moderation, and whether push or presence is degrading. Give operators insight and the ability to adjust messaging, discounts, or notifications on the fly when traffic spikes.
What’s Next
eCommerce applications transform shopping into an interactive, engaging experience that allows you to create real-time social connections that keep buyers connected, excited, and coming back.
While standing up global, sub-100ms inventory events can feel daunting, PubNub supports the full functionality of a real-time platform: live messages delivered globally with low-latency, presence and state for reservations and in-cart notifications, message persistence for catch-up, and edge logic to ensure eCommerce platforms can support their customers worldwide.
Learn more about how PubNub supports eCommerce platforms. You can sign up for a free PubNub account once you are ready to get started by following our in-depth documentation to build or integrate the features you need.
Talk to our team when you are ready to review architecture, TCO, and a phased rollout before your next peak season.
Add Real-Time eCommerce Features Without Rebuilding Infrastructure
Ready to see how you can implement real-time bidding, chat, notifications, and more into your own platform? Tell us what you're building, and we'll follow up with the next steps.
eCommerce (electronic commerce) is when a transaction occurs using the internet. An example is when a customer (the buyer) purchases one or more products or services online from a virtual storefront (the seller). eCommerce applications or e-commerce apps are design patterns of functionality needed to list items for purchase, facilitate a transaction by accepting payment methods, and initiate fulfillment or delivery of those purchases.
What is mobile eCommerce app?
Mobile e-commerce applications and shopping apps also function as marketing tools when they allow for paid strategic placement of items for sale or use push notifications to market products. Mobile app development for e-commerce is also called m-commerce or mCommerce.
Transactions that occur in the eCommerce industry can usually be classified as business-to-consumer (B2C), consumer-to-consumer (C2C), or business-to-business (B2B). eCommerce apps are optimized around the buyer and seller relationship. These categories are a way to break down the different types of eCommerce app experiences in the eCommerce industry and the various applications of e-commerce.
Key Features of eCommerce Apps:
- Product Listings: Detailed descriptions, images, prices, and availability of products. Categories and search functionality to help users find products easily.
- Shopping Cart: Allows users to add products they wish to purchase and review them before proceeding to checkout.
- Payment Processing: Integration with various payment gateways (credit/debit cards, digital wallets, bank transfers) to facilitate secure transactions.
- User Accounts: Features for user registration, login, and profile management. Order history, wish lists, and personalized recommendations.
- Order Management: Tools for tracking orders, managing returns, and handling customer inquiries.
- Notifications: Push notifications to inform users about order status, promotions, and new products.
- Customer Reviews and Ratings: Allow customers to leave feedback and rate products, helping others make informed decisions.
- Shipping and Delivery Options Information on shipping methods, costs, and delivery times. Order tracking capabilities.
- Return feature is essential for managing product returns and ensuring customer satisfaction.
- Customer Support Access to customer service through chat, email, or phone.
- Analytics and Reporting Tools for businesses to track sales performance, customer behavior, and inventory levels.
Types of eCommerce Apps:
Business to Consumer (B2C) eCommerce Applications
A B2C eCommerce app is like a virtual retail store, listing items for sale, managing shopping carts, handling transactions, and shipping items. Examples include Amazon, Ebay, Allegro, Shopee and others.
Consumer to Consumer (C2C) eCommerce Applications
C2C eCommerce apps facilitate transactions between consumers, acting as intermediaries for payments and dispute resolution. eBay is a prime example, offering features like real-time online bidding and linking with social media for competitive marketing. Other C2C eCommerce Apps examples: Facebook Marketplace, Craigslist, Etsy, OLX
Business to Business (B2B) eCommerce Applications
B2B eCommerce apps cater to the unique needs of businesses selling to other businesses, often involving ongoing relationships and detailed negotiations. Features like chat and push notifications are essential. Alibaba is a leading example, providing a marketplace for small manufacturers and exporters to sell internationally. Other B2B eCommerce apps examples: BigCommerce, Adobe Commerce (formely MAGENTO), WooCommerce and others
Other popular names and synonyms to eCommerce app
Web Store
Online Store
Shopping App
Marketplace App or just "marketplace"
Retail App
eCommerce Platform
How PubNub can integrate with eCommerce app
PubNub is a global, real-time messaging platform ideal for low-latency, event-driven communication in modern eCommerce systems. While it enables fast message delivery and synchronization, business logic (e.g., inventory control, order processing) must remain in backend services. Key use cases include:
1. Real-Time Support & Notifications
Live Chat: Use PubNub’s pub/sub APIs for instant messaging between users and agents, with presence, typing indicators, and global low-latency delivery. Backend handles sessions, storage, and escalation logic.
Buyer–Seller Messaging: Secure real-time chat with moderation via backend relay services.
Push Notifications: Use PubNub Blocks to trigger in-app alerts (e.g., shipping updates, promo alerts). For offline users, forward events to push gateways like APNs or FCM.
2. Order Tracking & Fulfillment
Order Status Updates: Backend detects state transitions and publishes updates via PubNub (e.g., order. channels).
Live Delivery Tracking: Driver apps stream GPS data to customer apps through secure PubNub channels, rendered in real time.
3. Inventory Sync (Advanced)
In flash-sale scenarios, PubNub broadcasts inventory updates (e.g., sku_1234: qty=12) to all connected clients. Backend manages actual inventory state and validation.
Production Considerations
Ordering: Guaranteed per-channel message order—design channels with care.
Scalability: Supports millions of connections globally with 99.999% SLA.
Security: Use PAM with JWT tokens for fine-grained access control.
Observability: Leverage analytics and message hooks for insight into real-time flows.
4. Collaborative e-Shopping
Shared Cart Experience: Multiple users can collaborate on a shopping session in real time. For example, family members can add items to a shared cart simultaneously, with each user seeing the updates instantly.
Social Shopping: Users can share their shopping experience with friends or family members by inviting them to view or suggest products in real time, enhancing the social aspect of online shopping.
5. Flash Sales and Real-Time Bidding
Flash Sales: PubNub can be used to manage real-time events like flash sales, where inventory is limited, and products sell out quickly. It ensures that all users are updated instantly when a sale starts or when an item is about to sell out.
Live Auctions: In an e-commerce platform that supports auctions, PubNub enables real-time bidding, allowing users to place bids and see the latest bid amounts instantly.
6. Personalized Real-Time Sale Recommendations
Dynamic Content Delivery: PubNub can deliver personalized recommendations to users in real time based on their browsing or shopping history. For example, if a user is looking at a specific product, PubNub can push related products or promotional offers instantly.
7. Backend App Monitoring and Alerts
In a production-grade eCommerce environment, rapid visibility into backend issues is critical for maintaining system uptime and customer trust. PubNub can serve as a real-time transport layer for operational alerts, enabling engineering and DevOps teams to respond quickly to incidents like:
Server outages or degraded performance
Payment gateway failures
Unexpected spikes in error rates
Suspicious or anomalous user behavior (e.g., bot attacks, fraud patterns)
Important Distinction:
Remember, that PubNub is not a monitoring tool in itself—it does not detect these events autonomously. Instead, external observability platforms (e.g., Datadog, Prometheus, Sentry, custom anomaly detection pipelines) are responsible for identifying such issues. Once detected, these systems can publish structured alerts to PubNub channels (e.g., alerts.devops, alerts.payments) to notify the appropriate teams via dashboards, mobile push, or live alerting UIs.
This approach allows alerts to be disseminated across globally distributed teams in real time, regardless of geography or device. Additionally, PubNub’s low-latency message delivery, presence features, and fine-grained access control make it well-suited for operational war rooms and NOC-style dashboards.
Example Flow:
Monitoring system detects a payment API timeout spike.
Alert rule triggers a webhook or serverless function.
Message is published to a PubNub alert channel (
alerts.payment).Subscribed clients (e.g., admin dashboards, Slack integrations, mobile apps) receive and display the alert instantly.
As with other real-time features in an eCommerce stack, it’s essential to reinforce that PubNub functions purely as the message transport layer. It doesn't perform analytics, health checks, or intelligent filtering — those capabilities must be built or integrated into the backend infrastructure.
8. User Activity Tracking
PubNub eCommerce Real-Time Analytics with Illuminate, enables real-time data insights by passively capturing user interactions and engagement —product views, cart actions, purchases, chat—without adding request overhead. Its globally distributed architecture ensures sub-millisecond event streaming, keeping dashboards instantly updated and responsive.
Illuminate integrates seamlessly with Kafka, Flink, and cloud warehouses (BigQuery, Snowflake), allowing real-time anomaly detection, segmentation, and AI-driven predictive analytics. Fraud patterns, cart abandonment, and bot activity can trigger automated interventions via PubNub Functions, executing edge-compute logic for personalized promotions, fraud prevention, or recommendation updates.
PubNub’s low-latency infrastructure makes it ideal for high-traffic eCommerce platforms, ensuring real-time insights scale efficiently. By leveraging event-driven automation with Illuminate, businesses optimize conversions, personalize experiences, and maintain operational agility without compromising performance.
9. Collaborative Filtering for Recommendations
PubNub doesn’t handle ML models at it's core, but it plays a key role in real-time data synchronization for collaborative filtering. As users interact with content, PubNub pushes activity data across devices and sessions, ensuring backend recommendation engines receive fresh input. This enables dynamic updates without manual refreshes.
While the heavy computation—such as similarity calculations or deep learning models—runs on separate infrastructure, PubNub acts as a low-latency messaging layer, reducing stale recommendations and enhancing real-time personalization.
10. Real-Time Feedback Collection
Instant Feedback: After a purchase or interaction, PubNub can push a prompt to users asking for feedback or ratings. This feedback is collected in real time and can be used immediately to improve service quality or product offerings.
Integration Approach:
To integrate PubNub with an e-commerce app, you would typically follow these steps:
SDK Integration: Integrate the PubNub SDK into your app, available for various platforms like iOS, Android, and web.
Channel Setup: Set up channels in PubNub for different types of real-time data, such as chat, notifications, or tracking information.
Publish/Subscribe Model: Use PubNub's publish/subscribe model to broadcast messages (like notifications) and allow users to subscribe to channels of interest.
Event Handling: Implement event listeners in your app to handle incoming messages, updates, or notifications in real time.
Security & Access Control: Configure PubNub's access management to secure the communication channels and ensure that only authorized users can access specific data streams.
Read more: Building Customer Data Insights Platform
Common Questions About eCommerce Applications
What is an eCommerce application?
An eCommerce application enables transactions over the internet, allowing customers to purchase products or services from virtual storefronts. These apps include features like product listings, shopping carts, and payment processing to facilitate online shopping.