For AI agents: visit https://documentation.paysimple.com/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI. Append .md to any documentation page URL to get its markdown version.
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Guides
API Reference
API 4 & 5
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API Reference
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API 4 & 5
Guides
API Reference
Payment Events
Overview
Welcome
Security and Compliance
Environments
Sandbox
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Frequently Asked Questions
API 4.0
Overview
PaySimpleJS
Overview
How it Works
Vaulting Accounts and Making Payments
Code Sample
Working with Existing Customers
Code Sample
Customizations
Stripe - 3D Secure Authentication
Product 3 Processing
API 5.0
Overview
Authorization
Catalog
Custom Fields
Merchants
Orders
Hosted Payment Links
Webhooks
Webhooks
Payment Events
Customer and Offering Events
Embeddables
Overview
Buy Now Button
SDKs
SDK for .NET on GitHub
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