Integration of a Comprehensive Payment System for In-House CRM

We are in search of a highly-skilled developer or a team to incorporate a robust payment feature into our existing in-house developed CRM. This new feature will significantly augment our CRM's capabilities by allowing for seamless financial transactions.

Key Functionalities Required:

Cash Transactions:

Accept cash payments.
Connect and operate with cash drawers to facilitate the dispensation and management of cash.
Credit & Debit Card Processing:

Integrate with MxMerchant for card transactions.
Ensure secure processing and storage (if necessary) of card details.
Payment Terminal Integration:

Enable our CRM to communicate and process transactions using payment terminals compatible with MxMerchant.
Checks:

Input and record check details into the CRM.
Implement a system to verify checks (if possible and required).
Gift Cards:

Process transactions using gift cards.
Record and update gift card balances within the CRM.
Desired Developer/Team Qualifications:

Proven experience in integrating payment systems within CRMs or other relevant platforms.
Familiarity with MxMerchant API and its integration.
Understanding of secure coding practices, especially when dealing with financial transactions.
Strong problem-solving skills and the ability to adapt to unique in-house CRM structures.
Deliverables:

Fully integrated payment feature within our CRM.
Thorough documentation detailing the new payment system's workflow, functionalities, and integration points.
A post-integration test report validating the correct function of all new features.
Training (if necessary) to our internal team on managing and troubleshooting the new payment feature.