Map example

 https://www.callicoder.com/java-hashmap/

Aws example in java

 https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code

Access S3 data without credentials

use Aws\S3\S3Client;

 $provider = CredentialProvider::defaultProvider();

$s3Client = new S3Client(array(
    'version'     => 'latest',
    'region'      => env('lambda_region'),
    'credentials'=>$provider
));

Unirest example

 http://kong.github.io/unirest-java/

Convert Array list into json array

 pushNotificationPayload.accumulate("playerIds",new JSONArray(listOfPlayerIds));

Map unknown json property into map

 https://attacomsian.com/blog/jackson-map-dynamic-json-object

public class User { public String name; public String email; private String[] roles; private boolean admin; private Map<String, Object> address = new HashMap<>(); @JsonAnySetter public void setAddress(String key, Object value) { address.put(key, value); }