code: public void setPayload(String payload) {
          setPayload(new com.amazonaws.adapters.types.StringToByteBufferAdapter().adapt(payload));
      }
docs: <p>
  The JSON that you want to provide to your Lambda function as input.
  </p>
  <p>
  The AWS SDK for Java performs a Base64 encoding on this field before sending this request to the AWS service.
  Users of the SDK should not perform Base64 encoding on this field.
  </p>
  <p>
  Warning: ByteBuffers returned by the SDK are mutable. Changes to the content or position of the byte buffer will
  be seen by all objects that have a reference to this object. It is recommended to call ByteBuffer.duplicate() or
  ByteBuffer.asReadOnlyBuffer() before using or reading from the buffer. This behavior will be changed in a future
  major version of the SDK.
  </p>
  
  @param payload
  The JSON that you want to provide to your Lambda function as input.