Request URL:https://client-analytics.sandbox.braintreegateway.com
Params:
authorizationFingerprint: [some fp]
sharedCustomerIdentifierType:undefined
analytics[][kind]:dropin.web.inline.add-card.fail
_meta[platform]:web
_meta[platformVersion]: [some value]
_meta[integrationType]:dropin
_meta[sdkVersion]:braintree/web/2.3.3
_meta[merchantAppId]:file:///Users/jiayaohan/Desktop/card.html
braintreeLibraryVersion:braintree/web/2.3.3
_method:POST
callback:callback_json9

callback_json9({status:201})