Using getAddress() / getaddress.io postcode address lookup with Salesforce Apex

GetAddressAPI.apex

public class GetAddressAPI {
    
    // Get Address API: https://getaddress.io/
    // Documentation: https://getaddress.io/Documentation
    
    public String getAddresses(String postcode) {
               
        if (postcode == null) {
            return null;
        }
        
        string responseData = makeAPICall(postcode);
        
        System.debug(responseData);
        
        if (responseData == null){
            return null;
        }
        
        LookupAddressResponse response = (LookupAddressResponse)JSON.deserialize(responseData, LookupAddressResponse.class);      
        
        List<LookupAddress> addresses = new List<LookupAddress>();
        
        for(string a : response.addresses){
            
            String[] segments = a.split(',');
            
            LookupAddress address = new LookupAddress();
            address.latitude = response.latitude;
            address.longitude = response.longitude;
            address.line1 = segments[0].trim();
            address.line2 = segments[1].trim();
            address.line3 = segments[2].trim();
            address.line4 = segments[3].trim();
            address.locality = segments[4].trim();
            address.townCity = segments[5].trim();
            address.county = segments[6].trim();
            address.postcode = postcode;
            
            String fullAddress = '';
            for (string segment : segments){
                if (String.isNotBlank(segment)){
                    if (fullAddress != ''){
                        fullAddress += ', ';
                    }
                    fullAddress += segment;
                }
            }
            fullAddress += ', ' + postcode;
            address.FullAddress = fullAddress;
            addresses.add(address);
        }
        
        return JSON.serialize(addresses);
    }
    
    public string makeAPICall(string postcode) {
        
        if (postcode == null) {
            return null;
        }        
                
        String url = 'https://api.getAddress.io/find/'
            + EncodingUtil.urlEncode(postcode.replace(' ', ''), 'UTF-8')
            + '?api-key=' + getAPIKey();
        
        Http http = new Http();
        HttpRequest request = new HttpRequest();
        HttpResponse httpResponse = new HttpResponse();
        request.setMethod('GET');
        request.setEndpoint(url);
        request.setTimeout(120000);
        httpResponse = http.send(request); 
        
        if (httpResponse.getStatusCode() == 200){
        	return httpResponse.getBody();    
        } else {
            System.debug(httpResponse.getStatusCode());
            System.debug(httpResponse.getBody());
            throw new AuraHandledException(httpResponse.getBody());
        }        
    }
    
    private String getAPIKey() {
        return ''; // Add your API key or get it from custom settings
    }
    
    class LookupAddressResponse {
        Decimal latitude;
        Decimal longitude;
        List<String> addresses;
    }
    
    class LookupAddress {
        Decimal latitude;
        Decimal longitude;
        String fullAddress;
        String line1;
        String line2;
        String line3;
        String line4;
        String locality;
        String townCity;
        String county;
        String postcode;
    }
}