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 planned at cdn.oid4pay.com/oid4ac-merchant/v1/loader.js; that host is not live yet. See the CDN bundle page for the storefront drop-in.

Not published yet. The packages are not on npm, PyPI or the Go module proxy yet, so the install commands on this page do not work today. They show the names the packages will ship under.