curl --request POST \
  --url https://api.privy.io/v1/users/{user_id}/mfa/sms/enrollment/init \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --header 'privy-app-id: <privy-app-id>' \
  --header 'privy-user-token: <privy-user-token>' \
  --data '
{
  "phone_number": "<string>"
}
'

HttpResponse<String> response = Unirest.post("https://api.privy.io/v1/users/{user_id}/mfa/sms/enrollment/init")
  .header("privy-app-id", "<privy-app-id>")
  .header("privy-user-token", "<privy-user-token>")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"phone_number\": \"<string>\"\n}")
  .asString();

const options = {
  method: 'POST',
  headers: {
    'privy-app-id': '<privy-app-id>',
    'privy-user-token': '<privy-user-token>',
    Authorization: 'Basic <encoded-value>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({phone_number: '<string>'})
};

fetch('https://api.privy.io/v1/users/{user_id}/mfa/sms/enrollment/init', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.privy.io/v1/users/{user_id}/mfa/sms/enrollment/init",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'phone_number' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "Content-Type: application/json",
    "privy-app-id: <privy-app-id>",
    "privy-user-token: <privy-user-token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.privy.io/v1/users/{user_id}/mfa/sms/enrollment/init"

	payload := strings.NewReader("{\n  \"phone_number\": \"<string>\"\n}")

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

	req.Header.Add("privy-app-id", "<privy-app-id>")
	req.Header.Add("privy-user-token", "<privy-user-token>")
	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))

}

{
  "success": true
}