Function jwt_sign 

pub fn jwt_sign(
    payload: &Value,
    secret: &str,
    algorithm: HashAlgorithm,
    header_options: Option<Map<String, Value>>,
) -> Result<String>

Generates a JWT (JSON Web Token).

Arguments

• payload - JWT payload as JSON object
• secret - Secret key for signing
• algorithm - Hash algorithm for HMAC
• header_options - Optional additional header fields

Returns

Complete JWT string (header.payload.signature).

Errors

Returns error if JSON serialization or signing fails.

Examples

use ccxt_core::auth::{jwt_sign, HashAlgorithm};
use serde_json::json;

let payload = json!({
    "user_id": "123",
    "exp": 1234567890
});

let token = jwt_sign(&payload, "secret", HashAlgorithm::Sha256, None).unwrap();