PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

Amazon Application Load Balancer (ALB) distributes incoming application traffic to increase availability and support content-based routing.

Amazon Web Services (AWS) is a comprehensive cloud services platform offering compute power, database storage, content delivery and other functionality.

Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.

Ruby is an open-source object-oriented programming language.

Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds.

Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface.

Alibaba Cloud Object Storage Service (OSS) is a cloud-based object storage service provided by Alibaba Cloud, which allows users to store and access large amounts of data in the cloud.