curl --request POST \
  --url http://localhost:3000/v1/entities/{entity_id}/sources \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "submission_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "attribute_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    submission_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    attribute_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a'
  })
};

fetch('http://localhost:3000/v1/entities/{entity_id}/sources', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "http://localhost:3000/v1/entities/{entity_id}/sources"

payload = {
    "submission_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "attribute_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://localhost:3000/v1/entities/{entity_id}/sources"

	payload := strings.NewReader("{\n  \"submission_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"attribute_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\"\n}")

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

}

{
  "data": {}
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "param": "<string>",
    "doc_url": "<string>",
    "suggestion": "<string>",
    "request_id": "<string>",
    "resource_type": "<string>",
    "resource_id": "<string>",
    "retry_after_seconds": 123,
    "validation_errors": [
      {
        "param": "<string>",
        "message": "<string>",
        "code": "<string>"
      }
    ]
  }
}