POST /api/data/v2/datasources/{datasetId}/schemas HTTP/1.1
Host: {instance}.domo.com
x-domo-authentication: {session_token}
Content-Type: application/json
Accept: application/json

{
  "columns": [
    {
      "name": "name",
      "id": "name",
      "type": "STRING",
      "visible": true,
      "order": 0
    },
    {
      "name": "id",
      "id": "id",
      "type": "LONG",
      "visible": true,
      "order": 0
    },
    {
      "name": "alertId",
      "id": "alertId",
      "type": "LONG",
      "visible": true,
      "order": 0
    }
  ]
}

curl --request POST \
  --url https://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas \
  --header 'Content-Type: application/json' \
  --header 'x-domo-authentication: <api-key>' \
  --data '
{
  "columns": [
    {
      "name": "name",
      "id": "name",
      "type": "STRING",
      "visible": true,
      "order": 0
    },
    {
      "name": "id",
      "id": "id",
      "type": "LONG",
      "visible": true,
      "order": 0
    },
    {
      "name": "alertId",
      "id": "alertId",
      "type": "LONG",
      "visible": true,
      "order": 0
    }
  ]
}
'

import requests

url = "https://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas"

payload = { "columns": [
        {
            "name": "name",
            "id": "name",
            "type": "STRING",
            "visible": True,
            "order": 0
        },
        {
            "name": "id",
            "id": "id",
            "type": "LONG",
            "visible": True,
            "order": 0
        },
        {
            "name": "alertId",
            "id": "alertId",
            "type": "LONG",
            "visible": True,
            "order": 0
        }
    ] }
headers = {
    "x-domo-authentication": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-domo-authentication': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    columns: [
      {name: 'name', id: 'name', type: 'STRING', visible: true, order: 0},
      {name: 'id', id: 'id', type: 'LONG', visible: true, order: 0},
      {name: 'alertId', id: 'alertId', type: 'LONG', visible: true, order: 0}
    ]
  })
};

fetch('https://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas', 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://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas",
  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([
    'columns' => [
        [
                'name' => 'name',
                'id' => 'name',
                'type' => 'STRING',
                'visible' => true,
                'order' => 0
        ],
        [
                'name' => 'id',
                'id' => 'id',
                'type' => 'LONG',
                'visible' => true,
                'order' => 0
        ],
        [
                'name' => 'alertId',
                'id' => 'alertId',
                'type' => 'LONG',
                'visible' => true,
                'order' => 0
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-domo-authentication: <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://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas"

	payload := strings.NewReader("{\n  \"columns\": [\n    {\n      \"name\": \"name\",\n      \"id\": \"name\",\n      \"type\": \"STRING\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"id\",\n      \"id\": \"id\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"alertId\",\n      \"id\": \"alertId\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    }\n  ]\n}")

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

	req.Header.Add("x-domo-authentication", "<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://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas")
  .header("x-domo-authentication", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"columns\": [\n    {\n      \"name\": \"name\",\n      \"id\": \"name\",\n      \"type\": \"STRING\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"id\",\n      \"id\": \"id\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"alertId\",\n      \"id\": \"alertId\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{instance}.domo.com/api/data/v2/datasources/{datasetId}/schemas")

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

request = Net::HTTP::Post.new(url)
request["x-domo-authentication"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"columns\": [\n    {\n      \"name\": \"name\",\n      \"id\": \"name\",\n      \"type\": \"STRING\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"id\",\n      \"id\": \"id\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    },\n    {\n      \"name\": \"alertId\",\n      \"id\": \"alertId\",\n      \"type\": \"LONG\",\n      \"visible\": true,\n      \"order\": 0\n    }\n  ]\n}"

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