Using passthrough APIs provided by GSPs

User's who don't have access to direct APIs can use the passthrough APIs provided by GSPs. The details of this are provided in this guide.

In case of passthrough APIs, the GSP provide a gsp_id and gsp_password instead of client_id and client_secret. We need to add these id and password in the request headers. The GSP uses them to validate and then replace these headers with their client_id and client_secret.

The code for using GSP credentials is something like this (test with TaxPro's passthrough APIs):

from gst_irn import Session

gsp_headers = {
    "aspid": CONFIG["GSP_ASP_ID"],
    "password": CONFIG["GSP_ASP_PASSWORD"],
}

session = Session(
    gstin=CONFIG["GSP_GSTIN"],
    client_id="",
    client_secret="",
    username=CONFIG["GSP_API_USERNAME"],
    password=CONFIG["GSP_API_PASSWORD"],
    public_key=CONFIG["PUBLIC_KEY"],
    gsp_headers=gsp_headers,
    base_url="https://gstsandbox.charteredinfo.com/",
)

session.generate_token()
details = session.get_gst_info("29AAACP7879D1Z0")