Magento Payment Gateway Integration and Stock management Fix Issue

I am looking for a Magento expert to help me with two issues on my website. The first task is to integrate the First Data AVS payment gateway. The second task is to fix some issues with my current stock management system. all Work remote through my pc. Fix Not More then 15$ Complete Work

Payment Gateway Integration:
- Experience with Magento payment gateway integration
- Knowledge of First Data AVS
- Ability to ensure secure payment processing

Stock Management Fix:
- Experience with Magento stock management
- Ability to troubleshoot and fix issues
- Knowledge of inventory management best practices

Priority:
- The stock management fix is the top priority
- Ability to work efficiently and quickly to resolve issues

If you have experience with Magento, payment gateway integration, and stock management, please submit a proposal.