curl -X POST \
    https://obligr.io/api_v2/user/billing_address \
  -H 'authorization: Bearer [YOUR_API_KEY]' \
  -H 'cache-control: no-cache' \
  -H 'content-type: application/json'
  -d 'company_name=XXXX&attn=XXXX'

<?php

                                                            $curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "https://obligr.io/api_v2/user/billing_address",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => array(
                            'company_name' => 'XXXX',
                            'attn' => 'XXXX',
                            'address' => 'XXXX',
                            'pincode' => '000000',
                            'city' => 'XXXX',
                            'state' => 'XXXX',
                            'country' => 'India',
                            'gst_number' => 'XXXX',
                            'gst_code' => '00',
                            'pan_number' => 'XXXX'
                            ),
  CURLOPT_HTTPHEADER => array(
    "Authorization: Bearer [YOUR_API_KEY]",
    "Content-Type: application/json"
  ),
));
$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

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