Add the necessary libraries to your project (e.g., npm install stripe or the PayPal JavaScript SDK ). 3. Implement the Core Payment Flow

Access your provider's developer dashboard to generate Publishable Keys (for client-side UI) and Secret Keys (for server-side logic).

Integrating a professional payment system into your SaaS application is a critical milestone for transitioning from a project to a business. By following a structured approach, you can automate revenue collection, manage global taxes, and provide a seamless checkout experience for your users.

Most modern integrations follow a standard flow to ensure security and PCI compliance:

Set up your "Product IDs" and "Price IDs" directly in the gateway's dashboard (e.g., a $20/month "Pro Plan") rather than hard-coding values.