As an experienced WordPress developer with a specialization in WooCommerce, I'm confident I can help you create a top-notch plugin that caters specifically to your needs. With over 6 years in the industry, my scope of work has familiarized me with various aspects of WordPress plugins & themes such as WooCommerce Avada and Elementor. In fact, I have even found my way around custom payment gateways, product customization options, and subscription services - functionalities you specifically mentioned.
Furthermore, having worked with different clients via platforms like Wix, Shopify among others, I've developed a flexible approach to projects which allows for quick adaptation to new plugins and themes. While you haven't provided detailed specifications yet, my proficiency with Advanced Shipping Options and Third-party integrations will be an invaluable asset throughout the process.
Reassuringly, my past projects align closely to your requirements. For instance, I've collaborated on projects that involved Dokan & WC Vendors where I successfully implemented payment gateway integrations and billing/shipping customizations. My hands-on experience would undoubtedly contribute to both the efficiency of the project and its cost-effectiveness. Given our shared base in India, my ability to offer long-term support becomes highly convenient for you as well. Let's further discuss your project requirements!