License Plate Validation

Available lang-locales: de (Germany), ch (Switzerland), and en (North America)

Parloa’s License Plate Validation Service is designed to process and validate license plates from specified regions – Germany (de), Switzerland (ch), and North America (NA). It checks for common mis-transcriptions between numbers and letters, validates against region-specific license plate formats, and returns the processed input.

Input Formatting

Input can be provided as a non-delimited string, like “B ER 1234,” or delimited with a “minus” – “B minus ER 1234.” The latter helps reduce ambiguity, especially beneficial when using phoneV2, as transcription may not reliably add spaces due to factors like talking speed.

For North American regions, separate the region identifier (e.g., state or province) and the license plate, then input both parameters into the service.

Hint: Retain spaces in states or provinces with multi-word names, such as “District of Columbia” or “Nova Scotia.”

Service Configuration

Branches

• single : A valid single result was found.

• multi: Multiple candidate license plates were found due to ambiguous input or multiple results like “Frankfurt.”

• fail: No valid license plate was detected.

Input

• utterance: The raw utterance of the caller. Retrieve it in a storage block with intent.rawPlatformRequestBody.text (phoneV2 only), and use the storage variable subsequently in the service call.

• region: Select between “de” (default), “ch” for Swiss, or a North American region* for license plate recognition. Note: For North American regions, your input to the region parameter should be the name of the state or province.

Output

• single: The single valid result formatted without delimiter

• ssml: The result wrapped in <say-as interpret-as="characters">...</say-as> SSML, with groups separated by short breaks. Returned as a JSON-stringified array.

• list: In case of ambiguous input or multiple results, a JSON-stringified array of candidates is provided.

• countyList: In case of ambiguous input or multiple results, a JSON-stringified array of county names is provided.

For ambiguous input, the index of array results is aligned between all output parameters (list, countyList, ssml).

Technical Configuration

• URL: https://parloaservices.azurewebsites.net/api/ValidateLicensePlate?clientId=<CLIENT_ID>

• Header: x-functions-key: <AUTHCODE>

For authentication, replace <AUTHCODE> and <CLIENTID> with the values provided by your Parloa representative.

Example Inputs

License plate from region de:

{
    "input": {
        "region": "de",
        "utterance": "KN AX 45"
    }
}

License plate from region North America:

{
    "input": {
        "region": "District of Columbia",
        "utterance": "AG5766"
    }
}