For AI agents: visit https://developers-ach.seamlesschex.com/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI.
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Seamless ACH API

The Seamless ACH API is built on REST architecture, and it communicates using JSON for data exchange. This API empowers you to link your software with banking systems for tasks such as transferring funds, confirming customer identities, and validating bank accounts. Our API is designed with user-friendly, resource-oriented URLs and employs HTTP response codes to signal any API errors. It's a versatile tool for integrating with your website, software applications, mobile apps, and more.

Seamless ACH Support: [email protected]

API ReferenceGuides
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GETTING STARTED

  • Seamless ACH API — Quick-Start

CHECKOUT.JS

  • Checkout.js Documentation

INTEGRATION GUIDES

  • On-Demand Payments
  • Online Gaming Integration Guide
  • Telemedicine Integration Guide
  • View More…

SEAMLESS ACH x WooCommerce PLUGIN

  • Installation Guide Seamless ACH x WooCommerce
  • Seamless ACH Email Notifications
  • Sync Seamless ACH Order Statuses with WooCommerce via Webhooks

ACH SPECIFICS

  • ACH Processing Times
  • ACH Return Codes

F.A.Q

  • Duplicate Transactions – FAQ
  • R01 (NSF) Returns

Guides

  • GETTING STARTED
  • CHECKOUT.JS
  • INTEGRATION GUIDES
  • SEAMLESS ACH x WooCommerce PLUGIN
  • View All…