curl --request POST \
  --url https://b2b-api-sandbox.easyonramp.com/api/v1/business/treasury/deposits/{id}/proof \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form bankId=1 \
  --form proof=@example-file

const form = new FormData();
form.append('bankId', '1');
form.append('proof', '<string>');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://b2b-api-sandbox.easyonramp.com/api/v1/business/treasury/deposits/{id}/proof', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://b2b-api-sandbox.easyonramp.com/api/v1/business/treasury/deposits/{id}/proof"

files = { "proof": ("example-file", open("example-file", "rb")) }
payload = { "bankId": "1" }
headers = {"Authorization": "Bearer <token>"}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.text)

package main

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

func main() {

	url := "https://b2b-api-sandbox.easyonramp.com/api/v1/business/treasury/deposits/{id}/proof"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"bankId\"\r\n\r\n1\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"proof\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")

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

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

{
  "id": "550e8400-e29b-41d4-a716-446655440003",
  "proofUrl": "https://b2b-api.easyonramp.com/api/v1/business/treasury/deposits/550e8400-e29b-41d4-a716-446655440003/proof"
}