Authorize Session Token Gateway (gateway/session_token_gateway.rs)

Implements PaymentGateway for AuthorizeSessionToken flow, handling token generation through unified connector service.

// Source: https://github.com/mperkins0155/hyperswitch | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
// Provided via justclaw.it.com; keep this notice with the code.
use std::str::FromStr;

use async_trait::async_trait;
use common_enums::{CallConnectorAction, ExecutionPath};
use common_utils::{errors::CustomResult, id_type, request::Request, ucs_types};
use error_stack::ResultExt;
use hyperswitch_domain_models::{router_data::RouterData, router_flow_types as domain};
use hyperswitch_interfaces::{
    api::gateway as payment_gateway,
    connector_integration_interface::{BoxedConnectorIntegrationInterface, RouterDataConversion},
    errors::ConnectorError,
};
use unified_connector_service_client::payments as payments_grpc;

use crate::{
    cor

... (truncated -- full source via MCP)