curl --request PATCH \
  --url https://api.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "blank_variables": [
    "custom"
  ]
}
'

import requests

url = "https://api.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}"

payload = { "blank_variables": ["custom"] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({blank_variables: ['custom']})
};

fetch('https://api.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}', 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.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'blank_variables' => [
        'custom'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}"

	payload := strings.NewReader("{\n  \"blank_variables\": [\n    \"custom\"\n  ]\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.patch("https://api.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"blank_variables\": [\n    \"custom\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.stardex.ai/v1/campaigns/{id}/enrollment-batches/{batch_id}/recipients/{recipient_id}")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"blank_variables\": [\n    \"custom\"\n  ]\n}"

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

{
  "success": true,
  "data": {
    "recipient_id": "a1c3e5f7-2b4d-4f6a-8c0e-1d3f5b7a9c21",
    "person_id": "2f6b9d1e-4a8c-4e3f-b7d2-1c5a9e3b7f40",
    "name": "Sam Patel",
    "email": "sam@gmail.com",
    "status": "ready",
    "issues": [
      {
        "code": "enrolled_in_other_campaign",
        "message": "Also in 'Q4 platform engineers' (running).",
        "details": {
          "campaigns": [
            "Q4 platform engineers"
          ]
        }
      }
    ],
    "enrollment_id": null,
    "first_email_estimated_at": "2026-10-19T08:00:00.000Z",
    "add_email_to_person": false,
    "overrides": [],
    "override_reason": null,
    "blank_variables": [
      "custom"
    ],
    "variables": {
      "first_name": {
        "value": "Sam",
        "source": "person"
      },
      "search_name": {
        "value": "Senior Backend Engineer",
        "source": "job"
      },
      "search_client": {
        "value": "Monzo",
        "source": "job"
      },
      "application_link": {
        "value": "https://jobs.stardex.com/acme-talent/senior-backend-engineer-k3f9a2",
        "source": "job"
      },
      "sender_first_name": {
        "value": "Riya",
        "source": "sender"
      },
      "personalization_line": {
        "value": "Loved your PyCon talk on async Python.",
        "source": "provided"
      },
      "ai:opening_line": {
        "value": "Your work scaling payments at Wise stood out.",
        "source": "ai"
      }
    },
    "steps": [
      {
        "step_id": "5b0f3c8e-2a71-4d0e-9a51-6f0c2d7e1a43",
        "order": 1,
        "type": "email",
        "send_after_days": 0,
        "subject": "Senior Backend Engineer role at Monzo",
        "body_html": "<div>Hi Sam,</div><div><br></div><div>Your work scaling payments at Wise stood out. I'm hiring a <strong>Senior Backend Engineer</strong> at Monzo. Loved your PyCon talk on async Python.</div><div><br></div><div>You can see the role <a target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://jobs.stardex.com/acme-talent/senior-backend-engineer-k3f9a2\">here</a>. Open to a chat?</div><div><br></div><div>Riya</div>",
        "edited": false
      },
      {
        "step_id": "9d2e7a14-61c3-4b8f-8f0e-3a5c9b2d4e17",
        "order": 2,
        "type": "email",
        "send_after_days": 3,
        "subject": "Re: Senior Backend Engineer role at Monzo",
        "body_html": "<div>Hi Sam, following up on my note.</div><div><br></div><div>Riya</div>",
        "edited": false
      },
      {
        "step_id": "c4a8e2f1-7b3d-4e6a-9c1f-2d8b5a7e3f90",
        "order": 3,
        "type": "manual",
        "send_after_days": 2,
        "subject": null,
        "body_html": "<div>Call Sam if they opened but did not reply.</div>",
        "edited": false
      }
    ]
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}

{
  "success": false,
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  }
}