SDKs

OID4Pay ships verify-only merchant SDKs for Node, Python, and Go that verify the wire shapes in the wire reference: offers, mandates, KB-JWTs, and catalogs. They share the same RFC 9421 and SD-JWT VC conformance harness. The browser bundle is a client-side loader, and the MCP server is the agent-side integration.

Our core merchant SDKs are MIT-licensed for zero-friction integration; our MCP agent server is Apache-2.0.

• Node / TypeScript: @oid4pay/oid4ac-merchant
• Python: oid4pay-oid4ac
• Go: github.com/oid4pay/oid4ac-go
• CDN bundle: @oid4pay/cdn-oid4ac-merchant
• MCP server: @oid4pay/oid4pay-mcp

For browser-side use the CDN bundle is at cdn.oid4pay.com/oid4ac-merchant/v1/loader.js. See the quickstart for the one-line storefront drop-in.