Crea un cfdi de emision.

curl -X POST https://apisandbox.facturama.mx/3/cfdis \
  -u usuario:password \
  -H 'Content-Type: application/json' \
  -d '{"NameId":"1"}'

var client = new HttpClient();
var credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes("usuario:password"));
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", credentials);
var body = new StringContent(JsonConvert.SerializeObject(cfdi), Encoding.UTF8, "application/json");
var response = await client.PostAsync("https://apisandbox.facturama.mx/3/cfdis", body);

const credentials = btoa('usuario:password');
const response = await fetch('https://apisandbox.facturama.mx/3/cfdis', {
  method: 'POST',
  headers: {
    'Authorization': `Basic ${credentials}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify(cfdi)
});
const data = await response.json();

import requests

response = requests.post(
    'https://apisandbox.facturama.mx/3/cfdis',
    auth=('usuario', 'password'),
    json=cfdi
)
data = response.json()

$ch = curl_init('https://apisandbox.facturama.mx/3/cfdis');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_USERPWD, 'usuario:password');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($cfdi));
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://apisandbox.facturama.mx/3/cfdis"

	payload := strings.NewReader("{\n  \"NameId\": \"1\",\n  \"Currency\": \"MXN\",\n  \"Folio\": \"100\",\n  \"Serie\": \"FA\",\n  \"CfdiType\": \"I\",\n  \"PaymentForm\": \"03\",\n  \"PaymentMethod\": \"PUE\",\n  \"OrderNumber\": \"TEST-001\",\n  \"ExpeditionPlace\": \"78000\",\n  \"Date\": \"2024-06-25T12:00:00\",\n  \"PaymentConditions\": \"CREDITO A SIETE DIAS\",\n  \"Observations\": \"Elemento Observaciones solo visible en PDF\",\n  \"Exportation\": \"01\",\n  \"Receiver\": {\n    \"Rfc\": \"URE180429TM6\",\n    \"CfdiUse\": \"CP01\",\n    \"Name\": \"UNIVERSIDAD ROBOTICA ESPAÑOLA\",\n    \"FiscalRegime\": \"601\",\n    \"TaxZipCode\": \"86991\"\n  },\n  \"Items\": [\n    {\n      \"ProductCode\": \"10101504\",\n      \"IdentificationNumber\": \"EDL\",\n      \"Description\": \"Estudios de laboratorio\",\n      \"Unit\": \"NO APLICA\",\n      \"UnitCode\": \"MTS\",\n      \"UnitPrice\": 50,\n      \"Quantity\": 2,\n      \"Subtotal\": 100,\n      \"TaxObject\": \"02\",\n      \"Taxes\": [\n        {\n          \"Total\": 16,\n          \"Name\": \"IVA\",\n          \"Base\": 100,\n          \"Rate\": 0.16,\n          \"IsRetention\": false\n        }\n      ],\n      \"Total\": 116\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Basic <encoded-value>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://apisandbox.facturama.mx/3/cfdis")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"NameId\": \"1\",\n  \"Currency\": \"MXN\",\n  \"Folio\": \"100\",\n  \"Serie\": \"FA\",\n  \"CfdiType\": \"I\",\n  \"PaymentForm\": \"03\",\n  \"PaymentMethod\": \"PUE\",\n  \"OrderNumber\": \"TEST-001\",\n  \"ExpeditionPlace\": \"78000\",\n  \"Date\": \"2024-06-25T12:00:00\",\n  \"PaymentConditions\": \"CREDITO A SIETE DIAS\",\n  \"Observations\": \"Elemento Observaciones solo visible en PDF\",\n  \"Exportation\": \"01\",\n  \"Receiver\": {\n    \"Rfc\": \"URE180429TM6\",\n    \"CfdiUse\": \"CP01\",\n    \"Name\": \"UNIVERSIDAD ROBOTICA ESPAÑOLA\",\n    \"FiscalRegime\": \"601\",\n    \"TaxZipCode\": \"86991\"\n  },\n  \"Items\": [\n    {\n      \"ProductCode\": \"10101504\",\n      \"IdentificationNumber\": \"EDL\",\n      \"Description\": \"Estudios de laboratorio\",\n      \"Unit\": \"NO APLICA\",\n      \"UnitCode\": \"MTS\",\n      \"UnitPrice\": 50,\n      \"Quantity\": 2,\n      \"Subtotal\": 100,\n      \"TaxObject\": \"02\",\n      \"Taxes\": [\n        {\n          \"Total\": 16,\n          \"Name\": \"IVA\",\n          \"Base\": 100,\n          \"Rate\": 0.16,\n          \"IsRetention\": false\n        }\n      ],\n      \"Total\": 116\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://apisandbox.facturama.mx/3/cfdis")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"NameId\": \"1\",\n  \"Currency\": \"MXN\",\n  \"Folio\": \"100\",\n  \"Serie\": \"FA\",\n  \"CfdiType\": \"I\",\n  \"PaymentForm\": \"03\",\n  \"PaymentMethod\": \"PUE\",\n  \"OrderNumber\": \"TEST-001\",\n  \"ExpeditionPlace\": \"78000\",\n  \"Date\": \"2024-06-25T12:00:00\",\n  \"PaymentConditions\": \"CREDITO A SIETE DIAS\",\n  \"Observations\": \"Elemento Observaciones solo visible en PDF\",\n  \"Exportation\": \"01\",\n  \"Receiver\": {\n    \"Rfc\": \"URE180429TM6\",\n    \"CfdiUse\": \"CP01\",\n    \"Name\": \"UNIVERSIDAD ROBOTICA ESPAÑOLA\",\n    \"FiscalRegime\": \"601\",\n    \"TaxZipCode\": \"86991\"\n  },\n  \"Items\": [\n    {\n      \"ProductCode\": \"10101504\",\n      \"IdentificationNumber\": \"EDL\",\n      \"Description\": \"Estudios de laboratorio\",\n      \"Unit\": \"NO APLICA\",\n      \"UnitCode\": \"MTS\",\n      \"UnitPrice\": 50,\n      \"Quantity\": 2,\n      \"Subtotal\": 100,\n      \"TaxObject\": \"02\",\n      \"Taxes\": [\n        {\n          \"Total\": 16,\n          \"Name\": \"IVA\",\n          \"Base\": 100,\n          \"Rate\": 0.16,\n          \"IsRetention\": false\n        }\n      ],\n      \"Total\": 116\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "Id": "J6MjEYRjnLnV6aMCK8dV-w2",
  "CfdiType": "ingreso",
  "Type": "I - ingreso",
  "Serie": "FA",
  "Folio": "100",
  "Date": "2024-06-25T12:00:00",
  "CertNumber": "30001000000500003416",
  "PaymentTerms": "03 - Transferencia electrónica de fondos",
  "PaymentMethod": "PUE - Pago en una sola exhibición",
  "PaymentAccountNumber": "",
  "PaymentBankName": "",
  "ExpeditionPlace": "78000",
  "ExchangeRate": 0,
  "Currency": "MXN - Peso Mexicano",
  "Subtotal": 100,
  "Discount": 0,
  "Total": 116,
  "Observations": "Elemento Observaciones solo visible en PDF",
  "Issuer": {
    "FiscalRegime": "601 - General de Ley Personas Morales",
    "Rfc": "EKU9003173C9",
    "TaxName": "ESCUELA KEMPER URGATE",
    "Email": "api@facturama.mx",
    "Phone": "4448356098",
    "TaxAddress": {
      "Street": "Cañada de Gomez",
      "ExteriorNumber": "128",
      "InteriorNumber": "",
      "Neighborhood": "Los Laureles",
      "ZipCode": "42501",
      "Municipality": "Piedras Negras",
      "State": "COAHUILA",
      "Country": "México"
    },
    "IssuedIn": {
      "Street": "",
      "ExteriorNumber": "",
      "Neighborhood": "-",
      "ZipCode": "78000",
      "Municipality": "",
      "State": "",
      "Country": "MEXICO"
    }
  },
  "Receiver": {
    "Rfc": "URE180429TM6",
    "Name": "UNIVERSIDAD ROBOTICA ESPAÑOLA",
    "Email": ""
  },
  "Items": [
    {
      "ProductCode": "10101504",
      "IdentificationNumber": "EDL",
      "UnitCode": "MTS",
      "Discount": 0,
      "CuentaPredial": "",
      "Quantity": 2,
      "Unit": "MTS - NO APLICA",
      "Description": "Estudios de laboratorio",
      "UnitValue": 50,
      "Total": 100
    }
  ],
  "Taxes": [
    {
      "Total": 16,
      "Name": "IVA",
      "Rate": 0,
      "Type": "transferred"
    }
  ],
  "Complement": {
    "TaxStamp": {
      "Uuid": "fe3c73d5-7881-49e0-80a3-e6c7e2eece40",
      "Date": "2024-06-25T12:00:00",
      "CfdiSign": "JvBbBtJZjW+xmCCrk/QW30JKrlYPlVdbLfiHfjtiZrSaI1En8pILqfBmBZ5znc...",
      "SatCertNumber": "30001000000500003456",
      "SatSign": "VaNEQDLc3XnkNXaFfTIHhOwoQwRwfdlGtaHjOA0wH8UZZvHwEZny3S3CaDWo1z...",
      "RfcProvCertif": "SPR190613I52"
    }
  },
  "Status": "active",
  "OriginalString": "||4.0|100|2024-06-25T12:00:00|03|30001000000500003416|100|MXN|116.00|I|01|PUE|78000|EKU9003173C9|..."
}