Check out example codes for "payment with stripe in php". It will help you in understanding the concepts better.

Code Example 1

<?php
use \PhpPot\Service\StripePayment;

if (!empty($_POST["token"])) {
    require_once 'StripePayment.php';
    $stripePayment = new StripePayment();
    
    $stripeResponse = $stripePayment->chargeAmountFromCard($_POST);
    
    require_once "DBController.php";
    $dbController = new DBController();
    
    $amount = $stripeResponse["amount"] /100;
    
    $param_type = 'ssdssss';
    $param_value_array = array(
        $_POST['email'],
        $_POST['item_number'],
        $amount,
        $stripeResponse["currency"],
        $stripeResponse["balance_transaction"],
        $stripeResponse["status"],
        json_encode($stripeResponse)
    );
    $query = "INSERT INTO tbl_payment (email, item_number, amount, currency_code, txn_id, payment_status, payment_response) values (?, ?, ?, ?, ?, ?, ?)";
    $id = $dbController->insert($query, $param_type, $param_value_array);
    
    if ($stripeResponse['amount_refunded'] == 0 && empty($stripeResponse['failure_code']) && $stripeResponse['paid'] == 1 && $stripeResponse['captured'] == 1 && $stripeResponse['status'] == 'succeeded') {
       $successMessage = "Stripe payment is completed successfully. The TXN ID is " . $stripeResponse["balance_transaction"];
    }
}
?>

Code Example 2

<?php
namespace PhpPot\Service;

require_once 'vendor/stripe/autoload.php';

use \Stripe\Stripe;
use \Stripe\Customer;
use \Stripe\ApiOperations\Create;
use \Stripe\Charge;

class StripePayment
{

    private $apiKey;

    private $stripeService;

    public function __construct()
    {
        require_once "config.php";
        $this->apiKey = STRIPE_SECRET_KEY;
        $this->stripeService = new \Stripe\Stripe();
        $this->stripeService->setVerifySslCerts(false);
        $this->stripeService->setApiKey($this->apiKey);
    }

    public function addCustomer($customerDetailsAry)
    {
        
        $customer = new Customer();
        
        $customerDetails = $customer->create($customerDetailsAry);
        
        return $customerDetails;
    }

    public function chargeAmountFromCard($cardDetails)
    {
        $customerDetailsAry = array(
            'email' => $cardDetails['email'],
            'source' => $cardDetails['token']
        );
        $customerResult = $this->addCustomer($customerDetailsAry);
        $charge = new Charge();
        $cardDetailsAry = array(
            'customer' => $customerResult->id,
            'amount' => $cardDetails['amount']*100 ,
            'currency' => $cardDetails['currency_code'],
            'description' => $cardDetails['item_name'],
            'metadata' => array(
                'order_id' => $cardDetails['item_number']
            )
        );
        $result = $charge->create($cardDetailsAry);

        return $result->jsonSerialize();
    }
}

Code Example 3

<?php if(!empty($successMessage)) { ?>
<div id="success-message"><?php echo $successMessage; ?></div>
<?php  } ?>
<div id="error-message"></div>

<form id="frmStripePayment" action="" method="post">
    <div class="field-row">
        <label>Card Holder Name</label> <span id="card-holder-name-info"
            class="info"></span><br> <input type="text" id="name"
            name="name" class="demoInputBox">
    </div>
    <div class="field-row">
        <label>Email</label> <span id="email-info" class="info"></span><br>
        <input type="text" id="email" name="email" class="demoInputBox">
    </div>
    <div class="field-row">
        <label>Card Number</label> <span id="card-number-info"
            class="info"></span><br> <input type="text" id="card-number"
            name="card-number" class="demoInputBox">
    </div>
    <div class="field-row">
        <div class="contact-row column-right">
            <label>Expiry Month / Year</label> <span id="userEmail-info"
                class="info"></span><br> <select name="month" id="month"
                class="demoSelectBox">
                <option value="08">08</option>
                <option value="09">9</option>
                <option value="10">10</option>
                <option value="11">11</option>
                <option value="12">12</option>
            </select> <select name="year" id="year"
                class="demoSelectBox">
                <option value="18">2018</option>
                <option value="19">2019</option>
                <option value="20">2020</option>
                <option value="21">2021</option>
                <option value="22">2022</option>
                <option value="23">2023</option>
                <option value="24">2024</option>
                <option value="25">2025</option>
                <option value="26">2026</option>
                <option value="27">2027</option>
                <option value="28">2028</option>
                <option value="29">2029</option>
                <option value="30">2030</option>
            </select>
        </div>
        <div class="contact-row cvv-box">
            <label>CVC</label> <span id="cvv-info" class="info"></span><br>
            <input type="text" name="cvc" id="cvc"
                class="demoInputBox cvv-input">
        </div>
    </div>
    <div>
        <input type="submit" name="pay_now" value="Submit"
            id="submit-btn" class="btnAction"
            onClick="stripePay(event);">

        <div id="loader">
            <img alt="loader" src="LoaderIcon.gif">
        </div>
    </div>
    <input type='hidden' name='amount' value='0.5'> <input type='hidden'
        name='currency_code' value='USD'> <input type='hidden'
        name='item_name' value='Test Product'> <input type='hidden'
        name='item_number' value='PHPPOTEG#1'>
</form>

Code Example 4

--
-- Table structure for table `tbl_payment`
--

CREATE TABLE `tbl_payment` (
  `id` int(11) NOT NULL,
  `email` varchar(255) NOT NULL,
  `item_number` varchar(255) NOT NULL,
  `amount` double(10,2) NOT NULL,
  `currency_code` varchar(55) NOT NULL,
  `txn_id` varchar(255) NOT NULL,
  `payment_status` varchar(255) NOT NULL,
  `payment_response` text NOT NULL,
  `create_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Indexes for table `tbl_payment`
--
ALTER TABLE `tbl_payment`
  ADD PRIMARY KEY (`id`);

--
-- AUTO_INCREMENT for table `tbl_payment`
--
ALTER TABLE `tbl_payment`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
COMMIT;

Code Example 5

<script type="text/javascript" src="https://js.stripe.com/v2/"></script>
<script src="vendor/jquery/jquery-3.2.1.min.js" type="text/javascript"></script>
<script>
function cardValidation () {
    var valid = true;
    var name = $('#name').val();
    var email = $('#email').val();
    var cardNumber = $('#card-number').val();
    var month = $('#month').val();
    var year = $('#year').val();
    var cvc = $('#cvc').val();

    $("#error-message").html("").hide();

    if (name.trim() == "") {
        valid = false;
    }
    if (email.trim() == "") {
    	   valid = false;
    }
    if (cardNumber.trim() == "") {
    	   valid = false;
    }

    if (month.trim() == "") {
    	    valid = false;
    }
    if (year.trim() == "") {
        valid = false;
    }
    if (cvc.trim() == "") {
        valid = false;
    }

    if(valid == false) {
        $("#error-message").html("All Fields are required").show();
    }

    return valid;
}
//set your publishable key
Stripe.setPublishableKey("<?php echo STRIPE_PUBLISHABLE_KEY; ?>");

//callback to handle the response from stripe
function stripeResponseHandler(status, response) {
    if (response.error) {
        //enable the submit button
        $("#submit-btn").show();
        $( "#loader" ).css("display", "none");
        //display the errors on the form
        $("#error-message").html(response.error.message).show();
    } else {
        //get token id
        var token = response['id'];
        //insert the token into the form
        $("#frmStripePayment").append("<input type='hidden' name='token' value='" + token + "' />");
        //submit form to the server
        $("#frmStripePayment").submit();
    }
}
function stripePay(e) {
    e.preventDefault();
    var valid = cardValidation();

    if(valid == true) {
        $("#submit-btn").hide();
        $( "#loader" ).css("display", "inline-block");
        Stripe.createToken({
            number: $('#card-number').val(),
            cvc: $('#cvc').val(),
            exp_month: $('#month').val(),
            exp_year: $('#year').val()
        }, stripeResponseHandler);

        //submit from callback
        return false;
    }
}
</script>

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