Apex class for SalesForce that takes an Address and get's Geolocation from Google Maps API.

SalesForceAddressToGeolocation.cls

public class Location {
    
    @InvocableMethod
    public static void getLatLong(List<Id> Ids){
        
        //Get opp
        Opportunity opp = [
            SELECT Id, jamiesmith__Location__Latitude__s, jamiesmith__Location__Longitude__s, jamiesmith__Street__c, jamiesmith__City__c, jamiesmith__State__c  
            FROM Opportunity 
            WHERE Id IN :Ids
            LIMIT 1
        ];

        //Build address & encode it
        String address = opp.jamiesmith__Street__c +' '+ opp.jamiesmith__City__c +' '+ opp.jamiesmith__State__c;
        address = EncodingUtil.urlEncode(address,'UTF-8');

        // Get API key from custom setting
        String apiKey = [SELECT jamiesmith__Key__c FROM jamiesmith__GoogleMapAPI__c ORDER BY LastModifiedDate LIMIT 1].jamiesmith__Key__c;
        
        //Build request
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://maps.googleapis.com/maps/api/geocode/json?key='+apiKey+'&address='+address+'&sensor=false');        
        request.setMethod('GET');
        request.setCompressed(false);            
        request.setHeader('Encoding','iso-8859-1');
        request.setHeader('Content-Type', 'application/x-www-form-urlencoded');
        request.setTimeout(120000);
        
        HttpResponse response = new http().send(request);

        if(response.getStatusCode() == 200) {
            
            JSONParser parser = JSON.createParser(response.getBody());
            Boolean hasLat = false;
            Boolean hasLng = false;
            //Parse response, updatea opp's lat/lng 
            while (parser.nextToken() != null)  {
                
                String key = String.valueOf(parser.getCurrentName());
                
                if (key == 'lat' && parser.getText() != 'lat' && !hasLat){
                    hasLat = true;
                    opp.jamiesmith__Location__Latitude__s = Double.valueOf(parser.getText());
                }
                else if (key == 'lng' && parser.getText() != 'lng' && !hasLng){
                    hasLng = true;
                    opp.jamiesmith__Location__Longitude__s = Double.valueOf(parser.getText());
                }

                if(hasLat && hasLng){
                    break;
                }
            }
            //Commit changes to DB
            update opp;
        }
        else {
            System.debug('Status NOT 200!');
            System.debug(response);
        }
    }
}