Below are the steps required to install and activate the ACH Payment Gateway module for WHMCS...

Download the latest build of the ACH Payment Gateway module and our licensing systemExtract and upload the files to your WHMCS web root / document rootNavigate to your WHMCS administrator area and select Setup => Payments => Payment GatewaysActivate the ACH Direct Debit GatewayInput your Braintree merchant ID, public and private keys as well as your ASPnix product licenseActivate the ACH Direct Debit Manager addon under Setup => Addon ModulesUnder your Braintree "Processing Settings" find the "Custom Fields" section and click "Add New"You will need to add 2 custom fields; invoice_id and user_id per the screenshots below

[singlepic id=72 w=320 h=240 float=left] [singlepic id=73 w=320 h=240 float=right]

Under your Braintree "Webhooks", click "Create New Webhook"You will set the Destination URL* and select both the "TRANSACTION" options per the screenshot below

HIGHLY recommend that you test in a sandbox environment first, note that the API details for sandbox and production are different.