Secure Payment Gateway Development

I'm seeking a skilled developer to create a secure pay-in, pay-out payment gateway software.

Key Requirements:
- Support for credit/debit cards, bank transfers, and digital wallets
- Advanced security features, including two-factor authentication

Ideal Skills and Experience:
- Proven experience in developing payment gateways
- Strong understanding of payment processing and security protocols
- Expertise in implementing advanced security measures like two-factor authentication

Please provide relevant work samples and a brief outline of your approach.