Stripe is a commonly used payment gateway. Stripe integration in Drupal 8 requires a stripe library. We can install the stripe library using Composer. Use the following command to install the stripe library using which Stripe integration in Drupal 8 is possible.

public function buildForm(array $form, FormStateInterface $form_state) {
  $stripe=array("secret_key"=>
  "********************", //Give your api keys for stripe account
  "publishable_key"=>
  "********************" //Give your api keys for stripe account
  );
  \Stripe\Stripe: :setApiKey($stripe['secret_key']);
  $publishable_key=$stripe['publishable_key'];
  $stripe_email=$_SESSION['stripe_email']; //Give your mail id
  $amount=100; //Give your  amount to be transfer
  $stripe amount=$amount *100;
  $form ['pay_button']=array('#type'=>
  'markup',
  '#markup'=>
  new FormattableMarkup('
 
  ', []),
);
  $form['submit']=array('#type'=>
  'submit',
  '#value'=>
  $this->
  t('Save'),
  '#button_type'=>
  'primary',
  );
  return $form;
}
/**
* {@inheritdoc}
*/
public function submitForm(array &
$form, FormStateInterface $form_state) {
  $token=$_POST['stripeToken'];
  $stripe=array("secret_key"=>
  "********************",
  "publishable_key"=>
  "********************"
  );
  \Stripe\Stripe: :setApiKey($stripe['secret_key']);
  $customer=\Stripe\Customer: :create(array('email'=>
  $mail, //give your mail id
  'card'=>
  $token));
  $description="User Registration";
  $charge=\Stripe\Charge: :create(array("amount"=>
  $amount, //Give your  amount to be transfer,
  'customer'=>
  $customer->
  id,
  "currency"=>
  "EUR", //You can change the currency format
  "description"=>
  $description));
  $msg="Successfully charged ".$amount;
  drupal_set_message($msg);
}

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