For AI agents: visit https://acheck21.readme.io/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI. Append .md to any documentation page URL to get its markdown version.

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Guides API Reference

Guides

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Getting Started

Introduction
ACH/Check21 Primer
Installation
Authentication
Creating your first transaction
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Checks API

Creating a transaction
Retrieving a transaction
Searching transactions
Deleting a transaction
Retrieving return details
Retrieving settlement details
Transaction validation
Finding Returned Transactions

Incoming Settlements

Incoming Settlements Introduction
Searching for incoming transactions
Reject incoming transaction(s)

Boarding API

Creating a merchant
Retrieving a merchant
Retrieving all merchants
Updating a merchant
Deactivating a merchant

Micro

MICR Encoding
Problem: Not Detecting Scanner
Problem: Internal Error called in illegal state
Problem: Transport not ready
Problem: Error libeay32.dll dynamic link library is missing
Problem: Can log into Micro Gateway, but cannot log into Micro Client.
Problem: The batch is stuck as "unknown"
How To: Deposit and delete checks

Canadian Payments

Canadian Processing Routing Number

Global Gateway

Merchant's Guide to The Global Gateway
ISO's Guide to Masters and Sub-masters
Merchant Funding (Disbursement Timeline)
Creating New Users

Error Codes and FAQ

Frequently Asked Questions (FAQ)
Microbilt API Error Codes
ACH/Check Return Codes

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