diff --git a/Block/Info.php b/Block/Info.php
index dd1821c..f56f92a 100644
--- a/Block/Info.php
+++ b/Block/Info.php
@@ -27,7 +27,7 @@ protected function cardData() {
 			// 2017-11-12
 			// "An initial reusable source for a card which requires a 3D Secure verification":
 			// https://mage2.pro/t/4893
-			$r = lSource::retrieve($initialSourceId);
+			$r = dfe_stripe_source($initialSourceId);
 		}
 		return $r;
 	}
diff --git a/Controller/CustomerReturn/Index.php b/Controller/CustomerReturn/Index.php
index 5344ff0..89c1200 100644
--- a/Controller/CustomerReturn/Index.php
+++ b/Controller/CustomerReturn/Index.php
@@ -1,6 +1,5 @@
 <?php
 namespace Dfe\Stripe\Controller\CustomerReturn;
-use Stripe\Source as lSource;
 /**
  * 2017-11-07
  * Note 1.
@@ -79,6 +78,6 @@ class Index extends \Df\Payment\CustomerReturn {
 	 * @return string
 	 */
 	final protected function isSuccess() {$this->s()->init(); return in_array(
-		lSource::retrieve(df_assert_sne(df_request('source')))['status'], ['chargeable', 'pending']
+		dfe_stripe_source(df_assert_sne(df_request('source')))['status'], ['chargeable', 'pending']
 	);}
 }
\ No newline at end of file
diff --git a/Facade/Card.php b/Facade/Card.php
index 817dbdd..12c0e23 100644
--- a/Facade/Card.php
+++ b/Facade/Card.php
@@ -14,6 +14,18 @@ final class Card implements \Df\StripeClone\Facade\ICard {
 	 */
 	function __construct($p) {
 		$p = dfe_stripe_a($p);
+		/**
+		 * 2017-11-12
+		 * A derived single-use 3D Secure source does not contain the bank card details,
+		 * so I retrieve the initial source.
+		 * "A derived single-use 3D Secure source": https://mage2.pro/t/4894
+		 * "An initial reusable source for a card which requires a 3D Secure verification":
+		 * https://mage2.pro/t/4893
+		 */
+		/** @var string|null $initialSourceId */
+		if ($initialSourceId = dfa_deep($p, 'three_d_secure/card')) {
+			$p = dfe_stripe_a(dfe_stripe_source($initialSourceId));
+		}
 		$this->_p = Token::isCard($p['id']) ? $p : ['id' => $p['id']] + $p['card'] + $p['owner'];
 	}
 
diff --git a/Facade/Token.php b/Facade/Token.php
index 1f73cdf..8d239c7 100644
--- a/Facade/Token.php
+++ b/Facade/Token.php
@@ -17,6 +17,7 @@ static function isCard($id) {return df_starts_with($id, 'card_');}
 	 * @used-by \Dfe\Stripe\Facade\Charge::tokenIsNew()
 	 * @used-by \Dfe\Stripe\Init\Action::sourceInitial()
 	 * @used-by \Dfe\Stripe\Method::transUrlBase()
+	 * @used-by \Dfe\Stripe\Payer::tokenIsSingleUse()
 	 * @param string $id
 	 * @return bool
 	 */
@@ -31,17 +32,11 @@ static function isPreviouslyUsedOrTrimmedSource($id) {return df_starts_with($id,
 	 * @used-by \Dfe\Stripe\Init\Action::sourceInitial()
 	 * @used-by \Dfe\Stripe\P\_3DS::p()
 	 * @used-by \Dfe\Stripe\P\Reg::v_CardId()
+	 * @used-by \Dfe\Stripe\Payer::tokenIsSingleUse()
 	 * @param string|null $id [optional]
 	 * @return string
 	 */
 	static function trimmed($id = null) {return dfcf(function($id) {return
-		df_trim_text_left($id ?: \Df\Payment\Token::get(dfpm(__CLASS__)->ii()), self::NEW_PREFIX)
+		df_trim_text_left($id ?: \Df\Payment\Token::get(dfpm(__CLASS__)->ii()), 'new_')
 	;}, [$id]);}
-
-	/**
-	 * 2017-11-12
-	 * @used-by trimmed()
-	 * @used-by \Dfe\Stripe\W\Strategy\Charge3DS::_handle()
-	 */
-	const NEW_PREFIX = 'new_';
 }
\ No newline at end of file
diff --git a/Init/Action.php b/Init/Action.php
index 3baa5d4..37b16d8 100644
--- a/Init/Action.php
+++ b/Init/Action.php
@@ -216,7 +216,7 @@ private function need3DS() {return
 	 * @return lSource|null
 	 */
 	private function sourceInitial() {return dfc($this, function() {return
-		!fToken::isPreviouslyUsedOrTrimmedSource($id = fToken::trimmed()) ? null : lSource::retrieve($id)
+		!fToken::isPreviouslyUsedOrTrimmedSource($id = fToken::trimmed()) ? null : dfe_stripe_source($id)
 	;});}
 
 	/**
diff --git a/Payer.php b/Payer.php
new file mode 100644
index 0000000..168e28d
--- /dev/null
+++ b/Payer.php
@@ -0,0 +1,33 @@
+<?php
+namespace Dfe\Stripe;
+use Dfe\Stripe\Facade\Token as fToken;
+use Stripe\Source as lSource;
+// 2017-11-12
+/** @used-by \Df\StripeClone\P\Charge::request() */
+final class Payer extends \Df\StripeClone\Payer {
+	/**
+	 * 2017-11-12
+	 * Note 1.
+	 * Some Stripe's sources are single-use: https://stripe.com/docs/sources#single-use-or-reusable
+	 * «Stripe API Documentation» → «Payment Methods Supported by the Sources API» → «Single-use or reusable»:
+	 * «If a source can only be used once, this parameter is set to `single_use`
+	 * and a source must be created each time a customer makes a payment.
+	 * Such sources should not be attached to customers and should be charged directly instead.»
+	 * Note 2. «Stripe API Reference» → «Sources» → «The source object» → `usage`:
+	 * «Either `reusable` or `single_use`.
+	 * Whether this source should be reusable or not.
+	 * Some source types may or may not be reusable by construction,
+	 * while other may leave the option at creation.
+	 * If an incompatible value is passed, an error will be returned.»
+	 * https://stripe.com/docs/api#source_object-usage
+	 * @override
+	 * @see \Df\StripeClone\Payer::tokenIsSingleUse()
+	 * @used-by \Df\StripeClone\Payer::cardId()
+	 * @used-by \Df\StripeClone\Payer::customerId()
+	 * @return bool
+	 */
+	protected function tokenIsSingleUse() {return dfc($this, function() {return
+		fToken::isPreviouslyUsedOrTrimmedSource($t = fToken::trimmed($this->token()))
+		&& 'single_use' === dfe_stripe_source($t)['usage']
+	;});}
+}
\ No newline at end of file
diff --git a/W/Strategy/Charge3DS.php b/W/Strategy/Charge3DS.php
index e9a6458..97f7c7c 100644
--- a/W/Strategy/Charge3DS.php
+++ b/W/Strategy/Charge3DS.php
@@ -39,8 +39,11 @@ protected function _handle() {
 			 * *) "A derived single-use 3D Secure source": https://mage2.pro/t/4894
 			 * *) "An initial reusable source for a card which requires a 3D Secure verification":
 			 * https://mage2.pro/t/4893
+			 * Note 3.
+			 * I intentionally do not add the «new_» prefix here,
+			 * because this source is single-use, and I do not plan to attach it to the customer anyway.
 			 */
-			Token::KEY => fToken::NEW_PREFIX . $this->e()->pid()
+			Token::KEY => $this->e()->pid()
 			/**
 			 * 2017-11-12
 			 * We do not need to set the bank card type: @see \Dfe\Stripe\Method::$II_CARD_TYPE
diff --git a/composer.json b/composer.json
index f598ef8..f2239d6 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
 	"name": "mage2pro/stripe"
-	,"version": "2.4.4"
+	,"version": "2.4.5"
 	,"description": "Stripe integration with Magento 2"
 	,"type": "magento2-module"
 	,"homepage": "https://mage2.pro/c/stripe"
@@ -11,7 +11,7 @@
 		"homepage": "https://mage2.pro/users/dmitry_fedyuk",
 		"role": "Developer"
 	}]
-	,"require": {"mage2pro/core": ">=3.3.7", "mage2pro/phone": ">=1.0.11", "stripe/stripe-php": ">=5.3"}
+	,"require": {"mage2pro/core": ">=3.3.8", "mage2pro/phone": ">=1.0.11", "stripe/stripe-php": ">=5.3"}
 	,"autoload": {"files": ["registration.php"], "psr-4": {"Dfe\\Stripe\\": ""}}
 	,"keywords": [
 		"3D Secure"
diff --git a/lib/main.php b/lib/main.php
index cc43e05..443bce5 100644
--- a/lib/main.php
+++ b/lib/main.php
@@ -1,11 +1,28 @@
 <?php
+use Dfe\Stripe\Method as M;
+use Stripe\Source as lSource;
 use Stripe\StripeObject as lO;
 /**
  * 2017-10-22 Allowing $o to be an array makes my algorithms shorter.
  * @used-by \Dfe\Stripe\Facade\Card::__construct()
+ * @used-by \Dfe\Stripe\Facade\Card::__construct()
  * @used-by \Dfe\Stripe\Facade\O::toArray()
  * @used-by \Dfe\Stripe\Init\Action::redirectUrl()
  * @param lO|array(string => mixed) $o
  * @return array(string => mixed)
  */
-function dfe_stripe_a($o) {return is_array($o) ? $o : $o->__toArray(true);}
\ No newline at end of file
+function dfe_stripe_a($o) {return is_array($o) ? $o : $o->__toArray(true);}
+
+/**
+ * 2017-11-12
+ * @used-by \Dfe\Stripe\Block\Info::cardData()
+ * @used-by \Dfe\Stripe\Controller\CustomerReturn\Index::isSuccess()
+ * @used-by \Dfe\Stripe\Facade\Card::__construct()
+ * @used-by \Dfe\Stripe\Init\Action::sourceInitial()
+ * @used-by \Dfe\Stripe\Payer::tokenIsSingleUse()
+ * @param string $id
+ * @return lSource
+ */
+function dfe_stripe_source($id) {return dfcf(function($id) {
+	dfps(M::class)->init(); return lSource::retrieve($id);
+}, [$id]);}
\ No newline at end of file