from chalice import Chalice, Response

app = Chalice(app_name='callback-service')
app.debug = True
LOGGER = app.log

@app.route('/callback', methods=['POST'], content_types=['text/xml'])
def get_system_metadata():
    LOGGER.debug('Callback called')
    request_body = app.current_request.raw_body
    LOGGER.debug('request body is {}'.format(request_body))