AlphaRomeoMike

<?php
    require "connection.php";
    $data = json_decode(file_get_contents("php://input"));
        $id     = $data->id;
        $name   = $data->name;
        $age    = $data->age;
        $phone  = $data->phone;

    $query = "CALL st_updateUser('$name', $age, '$phone', $id)";

AlphaRomeoMike

<?php
    require "connection.php";
    $data = json_decode(file_get_contents("php://input"));
        $name   = $data->name;
        $age    = $data->age;
        $phone  = $data->phone;

    $query = "CALL st_insertUser('$name', $age, '$phone')";

    if(mysqli_query($con, $query)) {

AlphaRomeoMike

<?php
    $con = mysqli_connect("localhost", "root", "", "api");
    if($con) {
        // echo "Connection Established";
    } else {
        die();
    }
?>

AlphaRomeoMike

-- phpMyAdmin SQL Dump
-- version 5.0.2
-- https://www.phpmyadmin.net/
--
-- Host: 127.0.0.1
-- Generation Time: Dec 10, 2020 at 09:46 PM
-- Server version: 10.4.14-MariaDB
-- PHP Version: 7.2.33

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";