miracle_print_fe/otras_salidas.php

<?php
header("Access-Control-Allow-Origin: *");

require __DIR__ . '/vendor/autoload.php';
use Mike42\Escpos\Printer;
use Mike42\Escpos\PrintConnectors\WindowsPrintConnector;
use Mike42\Escpos\EscposImage;
use Mike42\Escpos\PrintConnectors\FilePrintConnector;

$dataPrint = $_POST["dataPrint"];
$dataPrint = json_decode($dataPrint, true);

if($dataPrint && json_last_error() === JSON_ERROR_NONE) {
    print_r($dataPrint);
    $empresa = $dataPrint['empresa'] ?? '';
    $concepto = $dataPrint['concepto'] ?? '';  
    $productos = $dataPrint['productos'] ?? null;
    print_r($empresa);
    echo "<hr>";
    print_r($concepto);
    echo "<hr>";
    print_r($productos);
}