ShipupETA.init(
  {
    publicApiKey,
    defaultDestinationAddress,
    carrierCodesCssSelectorsMapping,
    language,
    estimationMode
  }
)

publicApiKey: string
- Required
- The public API key to use when consuming the Shipup API
- Can be found in the API & Webhooks section of the Shipup App
defaultOriginAddress: OriginAddress
- the fallback origin address to use in calls to fetchPredictions without an origin address
defaultDestinationAddress: Address
- the fallback destination address to use in calls to fetchPredictions without a destination address
carrierCodesCssSelectorsMapping: Object
- an object with Shipup carrier codes for keys and CSS selectors for values ; those selectors will be used to identify which DOM nodes should be used when injecting the prediction of a given carrier
language: 'en' | 'fr' | 'es'
- the language to use to display the predictions, supported languages are 'en', 'es' and 'fr'
- defaults to the browser language and falls back to English if that language is not supported
estimationMode: 'early' | 'safe' | 'range'
- sets which estimate to display when injecting prediction in DOM nodes
  - early displays the most optimistic estimation
  - safe adds an extra delay of one day to the optimistic estimation (before post-processing rules are applied)
  - range displays both the early and safe estimates as a date range, f.i. 12/02/2024 - 13/02/2024
- defaults to early