public function __construct(
    MagentoFrameworkModelContext $context,
    MagentoFrameworkRegistry $registry,
    MagentoFrameworkApiExtensionAttributesFactory $extensionFactory,
    MagentoFrameworkApiAttributeValueFactory $customAttributeFactory,
    MagentoPaymentHelperData $paymentData,
    MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
    MagentoPaymentModelMethodLogger $logger,
    MagentoFrameworkSessionSessionManagerInterface $session,
    MagentoCustomerModelSession $customerSession,
    MagentoFrameworkModelResourceModelAbstractResource $resource = null,
    MagentoFrameworkDataCollectionAbstractDb $resourceCollection = null,
    array $data = []
) {
    parent::__construct(
        $context,
        $registry,
        $extensionFactory,
        $customAttributeFactory,
        $paymentData,
        $scopeConfig,
        $logger,
        $resource,
        $resourceCollection,
        $data
    );

    $this->_customerSession = $customerSession;
    $this->_session = $session;
    /*
     * set api key for payment  >> sandbox api key or live api key
     */
    if ($this->getDebugFlag()) {
        StripeStripe::setApiKey($this->_helper->getConfigValue('api_key'));
    } else {
        StripeStripe::setApiKey($this->_helper->getConfigValue('api_key'));
    }
}

MagentoFrameworkObjectManagerInterface $objectManager,
MagentoCheckoutModelSession $checkoutSession,
MagentoFrameworkPricingPriceCurrencyInterface $priceCurrency,
MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig

$this->_priceCurrency = $priceCurrency;
$this->_objectManager = $objectManager;
$this->_checkoutSession = $checkoutSession;
$this->_scopeConfig = $scopeConfig;