Secure Payments for Websites and Apps

No matter the platform, immediately enable secure in-person, online, ACH, and mobile payment acceptance with Stax’ industry-leading API and mobile development kits.


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Process card-present and card-not-present payments in your platform with the industry’s leading RESTful API compatible with all languages.

Website Payments

Use Stax.js to create a seamless checkout process that matches the aesthetic of your website. Easily embed a credit card field iframe within an existing payment form.

Custom Integrations

Create webhooks to send data from the Stax API into other business tools such as Slack, Zapier, MailChimp, and CRMs and vice versa.

Software Platform Integration

Easily add payment processing capabilities to your software and mobile apps with comprehensive mobile software development kits in Javascript and Python, and language agnostic RESTful API.

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Single and Recurring Payments

Submit and accept one-time credit card or ACH payments through your website and use stored payment methods to set up subscriptions.

Enable Card Present and Card-not-Present Payments

Add card-present and card-not-present payment acceptance functionality and accept swiped and keyed payments through a single API.

Email and Text Invoices

Set up regular and scheduled invoices that reflect the professionalism and branding associated with your business via email or SMS text message.

Turn Card-Present Terminals Smart

Access more intelligent data and enhance payment capabilities with the ability to send and receive a defined set of transaction data from a card-present terminal into your platform through the API.

Accept and Protect Sensitive Payment Data

Keep sensitive payment data safe with our easy-to-use Javascript plug-in, Stax.js.

Charge and Tokenize Payments

Keep customer account information safe and secure with tokenized payments that limit PCI scope when accepting credit card and ACH payments in person, online, by phone, and on mobile.

Customized to Fit Your Website

Ensure your checkout process reflects your aesthetic by embedding a styleable Stax.js credit card field iframe within your existing payment form.

Level 1 PCI Compliance

Stax’ highest level of security and advanced payment risk management protocols ensure sensitive data is stored in compliance with PCI standards.

Create the Perfect Platform for Your Business

Enhance the development of your solution by adding or syncing customer management, inventory tracking, invoicing, recurring billing, mobile payments, and more.

API Documentation

iOS and Android SDKs

Swipe and key on-the-go payments with your mobile app by leveraging our developer-friendly software development kits for iOS and Android.

Sync Payments to Accounting Tools

Seamlessly send payment receipts to your accounting software the moment a transaction is made.

Instantly Update Customer Data

Automatically send payment confirmation to your customer the moment a transaction is processed.

Request a Quote

Discover how much you’ll save with an estimate from one of our Payment Consultants.