Wallester REST API

Card-issuing API for businesses and embedded finance

Scale faster with automated card issuance, real-time expense tracking and seamless integrations with your internal systems.

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Unlimited card issuance
Client Portal
Fraud monitoring
KYC & KYB service

Beyond your Client Portal

Managing hundreds of cards, accounts, and payments manually is inefficient. From card issuance to balance reconciliation, Wallester REST API automates the workflow, enabling your business to scale efficiently.

Diagram of a CRM system using a POST /cards API request to successfully create a virtual marketing card

Automatically create and manage cards for any user, team or product line.

Flowchart showing Wallester REST API syncing transactions and balances with a client accounting system

Synchronise balances, transactions and limits with your ERP or CRM systems.

JSON code for a GET transactions request showing date, team, and approved status over a green line graph

Build your own analytics, statistics and approval flows.

API permission diagram showing JSON access levels for Operations, Finance, and Marketing teams

Manage team access across multiple products with full control.

Illustration of a completed data sync between files and an accounting system via an API

Eliminate manual uploads, delays and reporting errors.

Advertisers. Enterprises. Global teams. They all rely on the Wallester API

Use Wallester’s free, fully structured and constantly updated REST API. Select only the modules and features your team needs to build workflows your way.

Scalable and flexible
Easily customise workflows for different teams and departments.
Fast onboarding
Complete full integration and testing in approximately one day.
Secure and compliant
All integrations meet PCI DSS, PSD2 and GDPR standards.
Proven in practice
Top advertisers rely on the API to automate thousands of tasks and scale for high-volume workflows.

How integration works

Wallester REST API fits seamlessly into your existing systems with no migration or additional tools required.

Connect systems
Integrate Wallester REST API with your ERP, CRM or other internal system.
Set automation rules
Define how cards are created, funded and monitored automatically.
Operate in real time
Check balances, manage approvals and synchronise data instantly.
Scale securely
Add users, countries and products — your infrastructure scales with you.

What you can automate

Balance and transactions
Retrieve real-time data for complete financial visibility and faster reconciliation.
Limits and controls
Programmatically manage budgets, restrictions and permissions for every team.
Card issuing
Instantly create virtual, disposable or physical cards linked to specific teams or projects.
Notifications and webhooks
Receive instant alerts for payment approvals, declines, and numerous other events on the platform.
Compliance and security
Automate KYB, KYC, AML and fraud checks to protect your business.

Enterprise-grade reliability

Wallester REST API runs on the same infrastructure that powers thousands of global businesses. Benefit from performance, security and uptime trusted by top‑tier enterprises worldwide.