paypal.com
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PayPal.com is the official platform for PayPal’s online payment services, letting individuals and businesses send, receive, and accept payments online. It includes product info for merchants, developer documentation and APIs for PayPal checkout and gateway integrations, and security resources.
More resources on Payment Gateways
PayPal Developer
Free resources for integration, top rec in r/ecommerce
Payment Gateway Integration Guide
Practitioner rec from r/Entrepreneur
Stripe Tutorial for Beginners
Highly upvoted in r/shopify for e-com setup
Best Payment Gateways for Ecommerce 2024
Comparison of Stripe, PayPal, Shopify Payments from r/ecommerce thread
Build an E-commerce Store with Stripe
Learn to build a complete e-commerce store and integrate secure payments using Stripe in this free course from freeCodeCamp.org!
shopify.com
Shopify.com is the official website for the Shopify e-commerce platform, enabling users to build online stores, manage products, and process payments through Shopify Payments or supported gateways. It also provides pricing information, tutorials, guides, and app integrations to help merchants learn about and optimize payment options.