curl --request POST \
  --url https://api-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link \
  --header 'Content-Type: application/json' \
  --header 'x-partner-apikey: <x-partner-apikey>' \
  --data '
{
  "type": "account_onboarding",
  "return_url": "https://b8af79f41056.eu.ngrok.io?key1=value1"
}
'

import requests

url = "https://api-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link"

payload = {
    "type": "account_onboarding",
    "return_url": "https://b8af79f41056.eu.ngrok.io?key1=value1"
}
headers = {
    "x-partner-apikey": "<x-partner-apikey>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-partner-apikey': '<x-partner-apikey>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    type: 'account_onboarding',
    return_url: 'https://b8af79f41056.eu.ngrok.io?key1=value1'
  })
};

fetch('https://api-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link', 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-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link",
  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([
    'type' => 'account_onboarding',
    'return_url' => 'https://b8af79f41056.eu.ngrok.io?key1=value1'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-partner-apikey: <x-partner-apikey>"
  ],
]);

$response = curl_exec($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-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link"

	payload := strings.NewReader("{\n  \"type\": \"account_onboarding\",\n  \"return_url\": \"https://b8af79f41056.eu.ngrok.io?key1=value1\"\n}")

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

	req.Header.Add("x-partner-apikey", "<x-partner-apikey>")
	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://api-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link")
  .header("x-partner-apikey", "<x-partner-apikey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"type\": \"account_onboarding\",\n  \"return_url\": \"https://b8af79f41056.eu.ngrok.io?key1=value1\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.cashfree.com/partners/merchants/{merchant_id}/onboarding_link")

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

request = Net::HTTP::Post.new(url)
request["x-partner-apikey"] = '<x-partner-apikey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"type\": \"account_onboarding\",\n  \"return_url\": \"https://b8af79f41056.eu.ngrok.io?key1=value1\"\n}"

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

{
  "created_at": "2023-07-24T12:24:44+0530",
  "expires_at": "2023-07-24T13:24:44+0530",
  "onboarding_link": "https://telr.cashfree.com/merchantwebapp/validate/..token..?goto=onboarding"
}

{
  "message": "Invalid authentication credentials",
  "code": "failed_authentication",
  "type": "invalid_request_error"
}

{
  "message": "Merchant not found or linked to partner",
  "code": "partner_connect_not_found",
  "type": "invalid_request_error"
}

{
  "message": "Product is already active for the merchant",
  "code": "merchant_product_is_active",
  "type": "invalid_request_error"
}

{
  "message": "bad URL, please check API documentation",
  "code": "request_failed",
  "type": "invalid_request_error"
}