Note Put the company_id, the Customer Company ID of the newly created customer, you got from the response data in a variable because you will need it later when you subscribe to a service plan.

method = "POST"
request_uri = "/LMPI/v2/customers"
body = {
    "company": {
        "name": "CSPITest",
        "address": "Main Street",
        "city": "LA",
        "state": "CA",
        "postal_code": "101",
        "country": "US",
        "note": ""
    },
    "user": {
        "login_name": "cspitest",
        "first_name": "Test",
        "last_name": "Test",
        "phone": {
            "area_code": "987",
            "number": "654-321",
            "extension": ""
        },
        "email": "test.test@cspi_test.com",
        "time_zone": "Pacific Standard Time",
        "language": "en-US"
    }
}
body = json.dumps(body)

res_status, res_data = cspi_conn.send_request(method, request_uri, body)

print "Response status: %s", res_status
print "Response data: \n%s", res_data

company_id = None
if res_status == 200:
    res_data = json.loads(res_data)
    company_id = res_data["company_id"]  # Put company_id in a variable

Response status: 200
Response data:
{
  "company_id": "640FE47F-5118-4D79-8221-A35D0DE2EE2C",
  "user": {
    "id": "B7F4B24F-3842-4112-BADF-B7C19B00FBC7",
    "login_name": "cspitest",
    "password": "hkcuc3528HK"
  }
}

Note Keep the subscription_id that you get from the response data because you will use it when you want to use Customers :: Subscription :: Update to update the subscription, such as when you want to add seats, extend the license, etc.

method = "POST"
request_uri = "/LMPI/v2/customers/%s/subscriptions" % company_id  #  Customer Company ID
body = {
    "service_plan_id": "5862A768-CB5F-4B71-8F35-B619040BDAD2",
    "units_per_license": 20
}
body = json.dumps(body)
res_status, res_data = cspi_conn.send_request(method, request_uri, body)

print "Response status: %s",  res_status
print "Response data: \n%s", res_data

subscription_id = None
if res_status == 200:
    res_data = json.loads(res_data)
    subscription_id = res_data["subscription_id"]  # Put subscription_id in a variable

Response status: 200
Response data:
{
  "subscription_id": "C6602FD7-2F15-4431-89CD-0355B80E1425",
  "product_name": "Clone-LMP-WFBSS",
  "service_url": "https://clp.trendmicro.com/?T=9ABIQ",
  "licenses": [
    {
      "product_id": "WFSBWXE3X",
      "version": "full",
      "ac_code": "WF-WBKG-ZDLB8-TSVW5-DV6MQ-ZTGC5-VHLDP",
      "units": 20,
      "license_start_date": "2013-05-15T00:00:00Z",
      "license_expiration_date": "2013-06-15T00:00:00Z",
      "start_charge_date": "2013-05-15T00:00:00Z"
    }
  ]
}

method = "POST"
request_uri = "/SMPI/service/wfbss/api/initialize?cids=%s" % company_id  # Customer Company ID
res_status, res_data = cspi_conn.send_request(method, request_uri)

print "Response status: %s",  res_status
print "Response data: \n%s", res_data

Response status: 200
Response data: