My function for calling REST endpoints from WordPress

functions.php

<?php 
  
  // ... functions.php stuff ....
  
// START HELPER API CALL FUNCTION
function makeApiCall( $url, $payload, $method = 'POST', $dataType = 'formData', $authHeader = null ) {

    $headers = array();

    if($dataType === 'json') {
        $headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=utf-8';
        $payloadToSend = $payload;
    } else {
        $headers['Content-Type'] = 'application/json; charset=utf-8';
        $payloadToSend = json_encode($payload);
    }

    if($authHeader)
        $headers['Authorization'] = $authHeader;

    $response = wp_remote_request( $url, array(
      'method'      => $method,
      'timeout'     => 45,
      'redirection' => 5,
      'httpversion' => '1.1',
      'blocking'    => true,
      'headers' => $headers,
      'body'        => $payloadToSend,
      'cookies'     => array(),
    ) );
    if ( is_wp_error( $response )) {
        $error_message = $response->get_error_message();
        return array( false, $error_message );
    } else if ( wp_remote_retrieve_response_code($response) !== 200 ) {
        return array( false, $response );
    } else {
        return array( true, wp_remote_retrieve_body($response) );
    }  
  }
// END HELPER API CALL FUNCTION