ACH Integration for OpenCart

I'm looking to integrate a new ACH (E-Check) solution for one-time payments into my OpenCart 1.5.6.4 environment using AMG Express.

Requirements:
- Setup in your own staging environment
- Integration must support only one currency
- Must specify and integrate with AMG Express

Ideal Skills and Experience:
- Strong experience with OpenCart, particularly version 1.5.6.4
- Proficient in ACH and E-Check payment integrations
- Familiarity with staging environments and deployment
- Ability to work with specified payment providers

Please ensure you have the relevant experience before bidding.