Authenticate with MoneyGram

Authenticate using SEP-10. Required information:

User’s integer ID (positive, ≤64 bits).
MoneyGram’s authentication endpoint:
MoneyGram’s public key:
- Test: GCUZ6YLL5RQBTYLTTQLPCM73C5XAIUGK2TIMWQH7HPSGWVS2KJ2F3CHS
- Preview/Production: GD5NUMEX7LYHXGXCAD4PGW7JDMOUY2DKRGY5XZHJS5IONVHDKCJYGVCL
Application’s authentication keypair.

Steps

Request authentication challenge.
MoneyGram provides challenge.
Verify MoneyGram’s signature.
Sign challenge with application’s key.
Submit signed challenge.
Receive session token.

import { Wallet, SigningKeypair } from "@stellar/typescript-wallet-sdk";

const wallet = Wallet.TestNet();

// Testnet
const MGI_ACCESS_HOST = "extstellar.moneygram.com";
// Mainnet
// const MGI_ACCESS_HOST = "stellar.moneygram.com";

// First we create an anchor object with MoneyGram's home domain.
const anchor = wallet.anchor({ homeDomain: MGI_ACCESS_HOST });

// Then we create the sep10 object which handles all the athentication steps.
const sep10 = await anchor.sep10();

// Finally, we authenticate using the wallet's SIGNING_KEY secret.
const authKey = SigningKeypair.fromSecret(AUTH_SECRET_KEY);
const authToken = await sep10.authenticate({ accountKp: authKey });

import requests
from stellar_sdk import Network
from stellar_sdk.sep.stellar_web_authentication import read_challenge_transaction

# Testnet
MGI_ACCESS_HOST = "extmgxanchor.moneygram.com"
# Pubnet
# MGI_ACCESS_HOST = "stellar.moneygram.com"

def get_token() -> str:
    query = f"{AUTH_URL}?account={AUTH_PUBLIC_KEY}&memo={USER_ID}"
    response = requests.get(query)
    body = response.json()
    challenge = read_challenge_transaction(
        challenge_transaction=body["transaction"],
        server_account_id=MGI_ACCESS_SIGNING_KEY,
        home_domains=MGI_ACCESS_HOST,
        web_auth_domain=MGI_ACCESS_HOST,
        network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE
    )
    challenge.transaction.sign(AUTH_SECRET_KEY)
    post_body = {
        "transaction": challenge.transaction.to_xdr()
    }
    response = requests.post(f"{AUTH_URL}", json=post_body)
    response_body = response.json()
    return response_body["token"]