I need an experienced developer to integrate Google Play payment into my existing trading app. We currently have a payment gateway, and require support for in-app purchases and one-time payments. Key Requirements: - Integrate Google Play payment system - Support in-app purchases and one-time payments - Work with existing payment gateway Ideal Skills and Experience: - Proven experience with Google Play payment integration - Familiarity with trading apps and payment gateways - Strong problem-solving skills - Attention to detail Please provide examples of similar work done and a timeline for completion.