Handle messages

When providing the on handler, you will receive messages from the WebSDK for the selected message type (all of them are prefixed with idCheck).

Message type	Payload	Description
`onReady`	Empty	WebSDK resources have been loaded.
`onInitialized`	Empty	The first screen is rendered.
`onStepInitiated`	`{ "idDocSetType": "$idDocSetType", "types": ["$idDocType1", "$idDocType2"] }`	A screen that corresponds to `$idDocSetType` was shown.
WebSDK — `stepCompleted` or `onStepCompleted` WebSDK 2.0 — `onStepCompleted`	In WebSDK: `{ "step": "$idDocSetType" }` In WebSDK and WebSDK 2.0: `{ "idDocSetType": "$idDocSetType" }`	Step `$idDocSetType` has been completed.
`onApplicantLoaded`	`{ "applicantId": "$id" }`	Applicant with id `$id` has been loaded.
`onApplicantSubmitted`	Empty	Documents were submitted for verification.
WebSDK — `applicantStatus` WebSDK 2.0 — `onApplicantStatusChanged`	`{ "reprocessing": false, "levelName": "$levelName", "createDate": "$createDate", "expireDate": "$expireDate", "reviewStatus": "$reviewStatus", "autoChecked": false }`	Applicant status has been changed.
`onApplicantResubmitted`	Empty	Documents re-submitted for verification.
`onApplicantActionSubmitted`	Empty	Applicant action was submitted.
`onApplicantActionCompleted`	`{ "action": "$actionType", "applicantActionId": "$id", "answer": "$answer" }`	Applicant action `$id` was completed.
`moduleResultPresented`	`{ "answer": "GREEN" }`	The result of the standalone module has been presented to the user. Valid only for the "module" customization types. Happens either when the user has just completed the check or when user reopened the module for the previously completed check. Possible answers: GREEN — check was successful. YELLOW — user is allowed to proceed, final check result will be determined later. RED — user has been decisively rejected and is not allowed to proceed. Not shown if the rejection is not final.
`onResize`	`{ "height": 159 }`	WebSDK frame has been resized.
`onVideoIdentCallStarted`	Empty	Video call was started by the user.
`onVideoIdentModeratorJoined`	Empty	Video call was answered by operator.
`onVideoIdentCompleted`	Empty	Video call was completed by operator.
`onUploadError`	`{ "code": "$error", "msg": "Error message" }`	Uploaded document was rejected.
`onUploadWarning`	`{ "code": "$warning", "msg": "Warning message" }`	Warnings about the uploaded document.
`onNavigationUiControlsStateChanged`	`{ "previousScreenButton": "normal" \| "disabled" \| null, "closeModalButton": "normal" \| null }`	The state of the navigation controls in the SDK. Pass `controlledNavigationBack: true` in the config to enable this event.