Java

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://api.plexi.com.br/api/maestro/........"))
    .header("Content-Type", "application/json")
    .header("Accept", "application/json")
    .header("Callback", "string")
    .header("Authorization", "Bearer {chave-api}")
    .method("POST", HttpRequest.BodyPublishers.ofString("{\n\t\"renavam\": \"99999\"\n}"))
    .build();
HttpResponse<String> response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

Substitua a URL da consulta, composta de Base URL + endpoint da consulta.

{chave-api}: chave da API que você visualiza acessando a interface

URL Base:

endpoint da consulta: Veja a documentação específica em https://crawly.atlassian.net/wiki/spaces/PLEXIAPI/pages/601522208