License Plate Number Reader in Salesforce

CaseService.apxc

public class CaseService {
    
    public static void UpdatePlateNumber(string record,string plate)
    {
        try
        {
            Case caseRecord=[Select Id, Plate_Number__c from Case where id=:record];
            caseRecord.Plate_Number__c=plate;
            update caseRecord;
        }
        catch(Exception e)
        {
            system.debug(e);
        }
    }
}

LicensePlateReader.apxc

public class LicensePlateReader {
    static string apiUrl='https://macgyverapi-license-plate-recognition-v1.p.rapidapi.com';
    static string token='*******************************'; // Your token here
    
    @InvocableMethod
    public static void getPlateNumber(List<string> records)
    {
        List<Id> recodId = new List<Id>();
        List<Case> cases = [SELECT Id FROM Case WHERE Id in :records];
        for (Case account : cases) {
            recodId.add(account.Id);
        }
        
        List<ContentDocumentLink> links=[SELECT ContentDocumentId,LinkedEntityId FROM ContentDocumentLink where LinkedEntityId=:recodId];
        Set<Id> ids=new Set<Id>();
        for(ContentDocumentLink link:links)
        {
            ids.add(link.ContentDocumentId);
        }
        
        List<ContentVersion> versions=[SELECT VersionData,Title,ContentDocumentId,FileExtension FROM ContentVersion WHERE ContentDocumentId = :ids AND IsLatest = true];
        
        List<ContentDistribution> cdts=[select ContentDocumentId,DistributionPublicUrl,ContentDownloadURL from ContentDistribution where ContentDocumentId =:ids];
        
        Map<String, String> contentList= new Map <String, String>();  
        for(ContentDistribution cdt:cdts)
        {
            contentList.put(cdt.ContentDocumentId, cdt.ContentDownloadURL);     
        }
        for(ContentVersion attach:versions)
        { 
            PlateReaderRequest request=new PlateReaderRequest();
            request.id='3X5D3d2k';
            request.key='free';
            PlateReaderRequest.RequestImage data=new PlateReaderRequest.RequestImage();
            data.country='us';            
            if(cdts.size()>0)
            {
                String imageUrl=contentList.get(attach.ContentDocumentId);
                system.debug('imageUrl'+imageUrl);
                if(string.isNotBlank(imageUrl))
                {                
                    data.image_url=imageUrl;
                    data.numberCandidates=2;
                    request.data=data;
                    string requestBody=JSON.serialize(request);
                    string response=callAPI(requestBody);
                    
                    PlateNumberResponse plateRespone=PlateNumberResponse.parse(response);
                    if(plateRespone!=null && plateRespone.results!=null)   
                    {
                        PlateNumberResponse.Result result=plateRespone.results[0];
                        if(result.Candidates!=null)
                        {
                            PlateNumberResponse.Candidate candidate=result.Candidates[0];
                            if(candidate!=null)
                            {
                                CaseService.UpdatePlateNumber(recodId[0],candidate.plate);
                            }
                        }
                    }
                }
            }
        }
    }
    
    private static string callAPI(string body)
    {
        Http h = new Http();
        HttpRequest hr = new HttpRequest();
        hr.setHeader('x-rapidapi-host', 'macgyverapi-license-plate-recognition-v1.p.rapidapi.com');
        hr.setHeader('x-rapidapi-key', '*****************************************'); //uppdate your key from step 1
        hr.setHeader('Content-type', 'application/json');
        hr.setHeader('accept', 'application/json');
        hr.setHeader('useQueryString', 'true');
        hr.setTimeout(60000);
        hr.setEndpoint(apiUrl);
        hr.setMethod('POST');
        hr.setBody(body);
        HttpResponse r = h.send(hr);
        return r.getBody();
    }
}

PlateNumberResponse.apxc

public class PlateNumberResponse{
    public Decimal processing_time_ms{get;set;}
    public Integer img_width{get;set;}
    public Integer img_height{get;set;}
    public Decimal epoch_time{get;set;}
    public list<String> regions_of_interest{get;set;}
    public String data_type{get;set;}
    public list<Result> results{get;set;}
    public Integer version{get;set;}
    public class Result{
        public String region{get;set;}
        public Integer region_confidence{get;set;}
        public Integer plate_index{get;set;}
        public Decimal processing_time_ms{get;set;}
        public Integer matches_template{get;set;}
        public Integer requested_topn{get;set;}
        public Decimal confidence{get;set;}
        public list<Coordinate> coordinates{get;set;}
        public list<Candidate> candidates{get;set;}
        public String plate{get;set;}
    }
    public class Coordinate{
        public Integer x{get;set;}
        public Integer y{get;set;}
    }
    public class Candidate{
        public Decimal confidence{get;set;}
        public Integer matches_template{get;set;}
        public String plate{get;set;}
    }
    
    public static PlateNumberResponse parse(String json) {
        return (PlateNumberResponse) System.JSON.deserialize(json, PlateNumberResponse.class);
    }
}

PlateReaderRequest.apxc

public class PlateReaderRequest
{
    public string id{get;set;}
    public string key{get;set;}
    public RequestImage data{get;set;}
    
    public class RequestImage
    {
        public string image_url{get;set;}
        public string country{get;set;}
        public integer numberCandidates{get;set;}
    }
}