Vayana GSP Pass-Through API Service (PAS)
Vayana GSP's Pass-Through API Service is the thin, last-mile gateway to the GSTN and NIC ecosystems for integrators who want to speak the government contracts directly. The caller populates the government headers, builds and encrypts the payload, wraps it in an envelope and decrypts the response; Vayana supplies the authorized GSP routing (GSP code "vay"), keypair-based auth-token construction, and Client-ID/Cust-ID identification. Documented calls cover GSTN OTP request, GSTN authentication, GSTR-1 B2B save and get, search taxpayer, E-Way Bill authentication, generate and get, and e-invoice authentication, generate and get.