Integrate Stripe and Paypal Payment Gateways into Existing Website

I am seeking a skilled freelancer to integrate both Stripe and PayPal payment gateways into my existing website. The goal is to provide customers with secure and seamless payment options during checkout. The integration should cover all necessary steps, including setting up API connections, handling transaction processing, and ensuring a smooth user experience. The freelancer should also be able to conduct thorough testing to confirm functionality and security. Please describe your experience with similar integrations and any specific platforms or technologies you are proficient in.