API credentials can be provided either as a string of static credentials. Credentials can also be provided dynamically via a callback function which takes the request as a parameter.

Example: Use dynamic environment variables for API key

import {CredentialProvider} from "@rezkit/tours";
import {AxiosRequestConfig} from "axios";
import TourManager from "@rezkit/tours";

// envProvider creates a function that returns the credentials from the specified env var
function envProvider(envKey: string): CredentialProvider {
    return async function (req: AxiosRequestConfig): Promise<string> {
        return process.env[envKey]
    }
}

const client = new TourManager({ api_key: envProvider('RK_API_KEY') })