Form Submission from Checkout for Responsys

We are currently trying to use a form within checkout to pass the email address and Opt-in/Out using:

MultiValueMap<String, String> form = new LinkedMultiValueMap<String, String>()

1. form.add("EMAIL_ADDRESS_", emailAddress)
2. form.add("EMAIL_ORIG_SOURCE", "WEB SIGNUP FORM")
3. form.add("EMAIL_PERMISSION_STATUS_", isOptIn ? "Y" : "N")
4. form.add("_ri_", "X0Gzc2X%3DYQpglLjHJlYQGgtsPsycBISClkdDvv44Iyze6wwwoMDnzbjGGVwjpnpgHlpgneHmgJoXX0Gzc2X%3DYQpglLjHJlYQGNg2HzbBXEOqHjPmczbzfoCYK76wwwoMDnzbjGG")

RestBuilder restBuilder = RestBuilderUtil.assembleDefaultRestBuilder()

try {

def response = restBuilder.post("https://shop.haband.com/pub/rf") {

accept("application/json")

contentType("multipart/form-data")

body(form)

}

if (response.statusCode.is2xxSuccessful()) {

return

}

log.error("Failed to opt in or out of email for ${emailAddress}")