PHP Stripe gateway

composer.json

{
    "require": {
        "stripe/stripe-php": "^6.8",
        "phpmailer/phpmailer": "^6.0",
        "symfony/polyfill-mbstring": "^1.8"
    }
}

stripe.php

<?php
require_once('vendor/autoload.php');
define('ENV','dev'); //dev, live
define('STRIPE_TEST_PK','');
define('STRIPE_TEST_SK','');
define('STRIPE_LIVE_PK','');
define('STRIPE_LIVE_SK','');

class StripeGateway
{

    /**
     * Enviroment
     *
     * const ENV = development or production
     */
    const ENV = 'development';

    private $stripe_test_sk = STRIPE_TEST_SK;

    private $stripe_live_sk = STRIPE_LIVE_SK;

    public function __construct()
    {

        \Stripe\Stripe::setApiKey(self::ENV == 'development' ? $this->stripe_test_sk : $this->stripe_live_sk);

    }

    public function charge()
    {

        $error = '';

        try {
            if(isset($_POST['stripeToken']) && isset($_POST['amount']) && isset($_POST['currency'])) {
                $token = $_POST['stripeToken'];
                $amount = $_POST['amount'];
                $currency = $_POST['currency'];

                $charge = \Stripe\Charge::create(['amount' => $amount, 'currency' => $currency, 'source' => $token]);
            }
        } catch (\Stripe\Error\Card $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\InvalidRequest $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Authentication $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\ApiConnection $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Base $e) {
            $error = $e->getMessage();
        } catch (Exception $e) {
            $error = $e->getMessage();
        }

        if($error !== "")
            return ['status' => 'error', 'message' => $error];

        //return charge object
        return $charge;
    }

    public function createCustomer()
    {

        $error = '';

        try {
            if(isset($_POST['stripeToken']) && isset($_POST['stripeEmail'])) {

                $token = $_POST['stripeToken'];
                $email = $_POST['stripeEmail'];
                $description = $_POST['description'];

                $customer = \Stripe\Customer::create([
                    "description" => $description,
                    "email" => $email,
                    "source" => $token,
                ]);
            }
        } catch (\Stripe\Error\Card $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\InvalidRequest $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Authentication $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\ApiConnection $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Base $e) {
            $error = $e->getMessage();
        } catch (Exception $e) {
            $error = $e->getMessage();
        }

        if($error !== "")
            return ['status' => 'error', 'message' => $error];

        //return customer object
        return $customer;

    }

    public function getCustomer($customer = "") { }

    public function subscribe($customer, $plan)
    {

        $error = '';

        try {
            $subscription = \Stripe\Subscription::create([
                "customer" => $customer->id,
                "items" => [
                    [
                        "plan" => $plan,
                    ],
                ],
            ]);
        } catch (\Stripe\Error\InvalidRequest $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Authentication $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\ApiConnection $e) {
            $error = $e->getMessage();
        } catch (\Stripe\Error\Base $e) {
            $error = $e->getMessage();
        } catch (Exception $e) {
            $error = $e->getMessage();
        }

        if($error !== "")
            return ['status' => 'error', 'message' => $error];

        //return subscription object
        return $subscription;
    }

}

view.html

<html>
<head>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">
</head>
<bodY>
    <div class="container">
    <div class="row">   
    <form method="POST" action="charge.php">
<label>Firstname</label>
<input type="text" name="fname" class="form-control">

<label>Lastname</label>
<input type="text" name="lname" class="form-control">

<script src="https://checkout.stripe.com/checkout.js"
class="stripe-button" data-key=""
data-name="Emma's Farm CSA" data-description="Subscription for 1 weekly box" data-amount="2000" data-label="Sign Me Up!">
// <![CDATA[// ]]></script>
</form>
<h2>Subscribe</h2>


<form method="POST" action="">
<script src="https://checkout.stripe.com/checkout.js"
class="stripe-button" data-key=""
data-name="Emma's Farm CSA" data-description="Subscription for 1 weekly box" data-amount="2000" data-label="Sign Me Up!">
// <![CDATA[// ]]></script>
</form>
    </div>
    </div>

</body>
</html>