SDKs

Three official server-side SDKs ship with OID4Pay. Each is a thin wrapper over the wire shapes in the wire reference. All three pass the same RFC 9421, SD-JWT VC, and DPoP conformance harness.

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

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.