Developer Guide

Your gateway to an integrated payments ecosystem.

Access a wide range of powerful APIs to build solutions on top of SeamlessChex. Our comprehensive payment processing suite supports eChecks, ACH, and credit cards — for ecommerce, subscriptions, marketplaces, and more.

ACH and eCheck Processing

SeamlessChex eCheck

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Create a Payment

Debit customers' bank accounts using routing and account numbers.

Create Payment Links

Accept payments without a website or app — generate a secure URL that lets customers pay online.

Create Subscriptions

Offer customers the convenience of subscribing to your services with automatic, recurring payments.

Checkout

Design and integrate Plaid-hosted payment buttons into your website with our flexible Checkout.JS.

Integrations

Plaid
WooCommerce
Shopify
OpenPath
DebtPayPro
WordPress
Moxy Analytics
Inline
Forte
Sticky
Granot
Cronetic

Verified ACH Payments and Payouts

Paynote

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Send Payments

Send payments through email or direct deposit.

Send Invoices

Send invoices to customers via email — one-time or recurring.

Create Payment Links

Generate one-time or recurring payment links for easy customer payments.

Create Subscriptions

Set up recurring payments and subscriptions.

Checkout

Embed Plaid-hosted payment buttons with our flexible Checkout.JS.

Create a Marketplace

Onboard users, connect Plaid-verified accounts, and facilitate secure transfers.

Save Bank Details

Save bank account info for hassle-free direct ACH debits in the future.

Integrations

Plaid
DebtPayPro
WooCommerce
WordPress

Debit and Credit Card Processing

Seamless Merchant

View Documentation →

Create Invoices

Create one-time or recurring charges.

Create Subscriptions

Set up subscriptions and recurring payments.

Save Cards

Capture customer authorization for future charges.

Customer Vaults

Safely store and manage customer payment information.

Create Payments

Create one-time or recurring payments.

Shopping Cart Integrations

Drop-in integrations for popular shopping carts.

Integrations

NMI
Authorize.net
Fluidpay

Why SeamlessChex?

Powerful payment solutions

Developer-friendly APIs that integrate eChecks, ACH, and credit cards — whether you're building an ecommerce store, a subscription service, or a marketplace.

Security first

Industry-leading encryption, verification, and compliance standards keep sensitive financial data protected end-to-end.

Seamless integration

Comprehensive docs, SDKs, and sample code accelerate your build. Drop-in integrations for popular carts and platforms.

Unparalleled support

A dedicated support team is always ready to help. Get answers fast when you hit a wall.

Build with SeamlessChex

Get API keys and start integrating in minutes.

Get Started