curl --request POST \
  --url https://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "type": "evm-message",
  "params": {
    "message": "Hello, world!",
    "signer": "evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E",
    "chain": "polygon"
  }
}
'

import requests

url = "https://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures"

payload = {
    "type": "evm-message",
    "params": {
        "message": "Hello, world!",
        "signer": "evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E",
        "chain": "polygon"
    }
}
headers = {
    "X-API-KEY": "<x-api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-KEY': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    type: 'evm-message',
    params: {
      message: 'Hello, world!',
      signer: 'evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E',
      chain: 'polygon'
    }
  })
};

fetch('https://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures', 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://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures",
  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' => 'evm-message',
    'params' => [
        'message' => 'Hello, world!',
        'signer' => 'evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E',
        'chain' => 'polygon'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-KEY: <x-api-key>"
  ],
]);

$response = curl_exec($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://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures"

	payload := strings.NewReader("{\n  \"type\": \"evm-message\",\n  \"params\": {\n    \"message\": \"Hello, world!\",\n    \"signer\": \"evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E\",\n    \"chain\": \"polygon\"\n  }\n}")

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

	req.Header.Add("X-API-KEY", "<x-api-key>")
	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://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures")
  .header("X-API-KEY", "<x-api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"type\": \"evm-message\",\n  \"params\": {\n    \"message\": \"Hello, world!\",\n    \"signer\": \"evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E\",\n    \"chain\": \"polygon\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://staging.crossmint.com/api/2022-06-09/wallets/{walletLocator}/signatures")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<x-api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"type\": \"evm-message\",\n  \"params\": {\n    \"message\": \"Hello, world!\",\n    \"signer\": \"evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E\",\n    \"chain\": \"polygon\"\n  }\n}"

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

{
  "id": "tx-b984491a-5785-43c0-8811-45d46fe6e520",
  "walletType": "evm-smart-wallet",
  "type": "evm-message",
  "status": "awaiting-approval",
  "params": {
    "message": "Hello, world!",
    "signer": "evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E",
    "chain": "polygon"
  },
  "approvals": {
    "pending": [
      {
        "signer": "evm-keypair:0xB17Ea8d34078424B9d7D126E444d5F2C3CC5c81E",
        "message": "Hello world!"
      }
    ],
    "submitted": []
  },
  "createdAt": "2024-01-01T00:00:00Z"
}

{
  "error": true,
  "message": "<error message>"
}

{
  "error": true,
  "message": "<error message>"
}