Imports github.com/braintree-go/braintree-go/customfields github.com/braintree-go/braintree-go/date github.com/braintree-go/braintree-go/xmlnil Standard library imports bytes compress/gzip context crypto/hmac crypto/sha1 crypto/tls encoding/base64 encoding/xml errors fmt io io/ioutil log net net/http net/url strconv strings text/template time unicode