Launch marketplace platforms with built-in buyer and seller infrastructure

Marketplace applications require authentication for buyers and sellers, messaging for transaction communication, payment processing with split logic, and storage for product listings. Conjoin provides infrastructure that handles marketplace complexity without custom implementation.

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The challenge

Marketplace complexity slows product launches

Building marketplaces means implementing separate authentication flows for buyers and sellers with different verification requirements, messaging systems that maintain transaction context and prevent spam, payment processing that splits funds between sellers and platform fees while handling refunds and disputes, and file storage for product images and transaction documents. Development teams spend months building user onboarding, notification systems, and billing logic, then struggle to scale infrastructure when transaction volume increases. When marketplace operators need reports about transaction patterns or seller performance, teams write custom queries against multiple databases and export data manually.

Workflows

How developers build solutions

See how Conjoin Auth, Messaging, Storage, Relay, and Billing connect to build modern applications.

Onboard buyers and sellers with flexible authentication

Conjoin Auth handles registration for buyers and sellers with verification requirements that match marketplace trust needs. Buyers register through social login or email verification, completing profiles with shipping addresses and payment methods. Sellers complete enhanced verification that captures business details, tax information, and bank accounts for payouts. Define verification tiers that unlock capabilities, requiring basic verification for buyers to make purchases while sellers need enhanced verification to list products. Auth maintains verification history and account standing, allowing marketplace operators to suspend users who violate policies.

Outcome

Launch user onboarding that balances friction with trust, reduce fraud through tiered verification, and manage user lifecycle without building custom account systems.

Facilitate transaction messaging with context and history

Conjoin Messaging creates conversation threads between buyers and sellers automatically when transactions initiate, maintaining message history that provides context for support teams resolving disputes. Send transactional notifications like order confirmations, shipping updates, and delivery confirmations through SMS, email, and push notifications with delivery tracking. Implement content filtering that prevents contact information exchange and spam while allowing legitimate transaction communication. Archive message threads attached to transaction records, preserving conversations for dispute resolution and compliance documentation.

Outcome

Enable buyer-seller communication without exposing personal contact information, reduce support burden through self-service messaging, and maintain conversation records that resolve disputes.

Process marketplace payments with split logic and payout scheduling

Conjoin Billing handles payment collection from buyers, escrow during fulfillment, and payouts to sellers with automatic platform fee calculation. Define split payment rules that distribute transaction amounts between sellers, platform fees, and processing costs. Schedule payouts to sellers based on configurable holding periods that protect against refunds and chargebacks. Process refunds through interfaces that return funds to buyers and adjust seller payouts automatically. Generate seller invoices showing transaction volume, platform fees, and net payouts for accounting and tax purposes.

Outcome

Launch payment processing without implementing custom escrow logic, increase marketplace revenue through transparent fee collection, and provide sellers with clear payout documentation.

Store product listings and transaction documents

Conjoin Storage encrypts product images, seller verification documents, and transaction records at rest and in transit. Sellers upload product photos that resize automatically for optimal display across devices. Store transaction documents like purchase orders, shipping labels, and refund receipts attached to transaction records where buyers and sellers access them through time-limited URLs. Define retention policies that archive transaction documents according to marketplace policies, ensuring evidence remains available for dispute periods.

Outcome

Eliminate infrastructure overhead from product image hosting, provide users with secure access to transaction documents, and maintain records that support dispute resolution.

Automate background tasks with scheduled jobs

Conjoin Relay processes background tasks like order status updates, payment reconciliation, and review reminders without managing servers. Define scheduled jobs that check payment statuses, update order tracking, and trigger notification workflows at specified intervals. Build event-driven workflows that respond to webhook events from payment processors and shipping providers, updating transaction states automatically. Queue tasks like image processing and data exports that run asynchronously without blocking user requests.

Outcome

Reduce infrastructure complexity by eliminating server management, ensure reliable task execution through automatic retries, and scale background processing without manual intervention.

10K

Users connected

60%

Reduction in payment disputes

$5M

In bookings processed

Capabilities

Platform features that power your applications

Built to handle the complexity of production systems

Tiered user verification

Implement verification requirements that match trust needs, requiring basic verification for buyers and enhanced verification for sellers.

Transaction messaging

Create conversation threads between buyers and sellers automatically, maintaining message history that provides context for support teams.

Split payment processing

Distribute transaction funds between sellers and platform fees with automatic calculation and payout scheduling.

Escrow and payout management

Hold funds during order fulfillment and release payouts to sellers based on configurable holding periods that protect against refunds.

Automated image optimization

Resize and optimize product images automatically for optimal display across web and mobile devices.

Background task processing

Run scheduled jobs and event-driven workflows for order updates, payment reconciliation, and notification delivery without server management.

Success stories

Real outcomes from teams like yours

See how developers achieve measurable results with Conjoin

Freelance marketplace connects 10,000 users in first year

Context

A startup built a marketplace connecting freelance designers with small businesses, handling project escrow, file sharing, and payments. The founding team included consumer product designers but no marketplace experience, and investors required transaction infrastructure before approving growth funding. The founders estimated eight months to implement user verification, messaging, and payment processing.

Implementation

The team integrated Conjoin Auth for buyer and seller registration, implementing tiered verification that required business details from sellers while allowing buyers to register through social login. Conjoin Messaging created conversation threads for each project, allowing buyers and sellers to discuss requirements and share feedback while preventing contact information exchange. Conjoin Billing collected payments from buyers into escrow, releasing funds to sellers when projects received approval. Split payment logic automatically calculated platform fees. Conjoin Storage hosted design files and project deliverables with automatic image optimization and version history.

Results

The marketplace launched five months after development started, connecting 10,000 users who completed 2,500 projects in the first year. Payment disputes decreased 60 percent because message history provided context that resolved misunderstandings. Platform revenue exceeded projections by 40 percent because transparent fee collection and seller payout documentation built trust that encouraged repeat transactions.

Rental marketplace processes $5M in bookings

Context

A marketplace connecting property owners with short-term renters needed to scale from 500 listings to 5,000 while maintaining trust and safety. The existing system handled basic booking and payment but lacked identity verification, automated messaging, and dispute resolution documentation. The team needed infrastructure that supported growth without rebuilding the entire platform.

Implementation

The team migrated to Conjoin Auth with enhanced verification that captured government IDs from property owners and renters, storing verification status and supporting documents. Conjoin Messaging automated booking confirmations, check-in instructions, and review requests with delivery tracking that confirmed users received critical information. Message threads preserved conversations between renters and owners, providing context for support teams resolving disputes. Conjoin Billing processed booking payments with split logic that distributed funds to property owners after check-in while holding security deposits in escrow. Conjoin Relay automated review reminders, payout scheduling, and booking status updates through scheduled jobs that ran without server management.

Results

The marketplace processed $5 million in bookings during the first year after migration, growing listing count by 800 percent. Fraud incidents decreased 75 percent through identity verification and trust scoring. Support resolution time decreased from four days to six hours because message history and transaction records provided complete context for disputes.

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