curl --request POST \
  --url https://api.despezzas.com/v1/transactions/{id}/installments \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '{
  "quantity": 3
}'

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({quantity: 3})
};

fetch('https://api.despezzas.com/v1/transactions/{id}/installments', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.despezzas.com/v1/transactions/{id}/installments"

payload = { "quantity": 3 }
headers = {
    "Authorization": "Basic <encoded-value>",
    "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 := "https://api.despezzas.com/v1/transactions/{id}/installments"

	payload := strings.NewReader("{\n  \"quantity\": 3\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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))

}

{
  "created": 3
}

{
  "message": "Credenciais de API inválidas",
  "statusCode": 401,
  "error": "Unauthorized"
}

{
  "message": "Credenciais de API inválidas",
  "statusCode": 401,
  "error": "Unauthorized"
}

{
  "message": "Credenciais de API inválidas",
  "statusCode": 401,
  "error": "Unauthorized"
}

{
  "message": "Credenciais de API inválidas",
  "statusCode": 401,
  "error": "Unauthorized"
}

{
  "message": "Credenciais de API inválidas",
  "statusCode": 401,
  "error": "Unauthorized"
}