The API Key associated with your plan for authenticating your requests.
import Microlink from '@microlink/react' export default () => <Microlink url='https://microlink.io' apiKey='MyApiKey' />
When you do not attach an API Key, you are going to use the free quota until you reach the daily rate limit.
To have a better daily quota, you need to have a plan. See pricing to know the plans.
After paying, you going to have the API key in your mail that you need to attach here for authenticating requests.