installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/includes/gateways/paypal/exceptions/class-api-exception.php

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+<?php
+/**
+ * API Exception
+ *
+ * Thrown when an API request has failed.
+ *
+ * @package   easy-digital-downloads
+ * @copyright Copyright (c) 2021, Sandhills Development, LLC
+ * @license   GPL2+
+ * @since     2.11
+ */
+
+namespace EDD\Gateways\PayPal\Exceptions;
+
+class API_Exception extends \Exception {
+
+}

wp-content/plugins/easy-digital-downloads/includes/gateways/paypal/exceptions/class-authentication-exception.php

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+<?php
+/**
+ * Authentication Exception
+ *
+ * Will be thrown if PayPal API credentials are missing or invalid.
+ *
+ * @package   easy-digital-downloads
+ * @copyright Copyright (c) 2021, Sandhills Development, LLC
+ * @license   GPL2+
+ * @since     2.11
+ */
+
+namespace EDD\Gateways\PayPal\Exceptions;
+
+class Authentication_Exception extends \Exception {
+
+}

wp-content/plugins/easy-digital-downloads/includes/gateways/paypal/exceptions/class-gateway-exception.php

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+<?php
+/**
+ * PayPal Gateway Exception
+ *
+ * @package   easy-digital-downloads
+ * @copyright Copyright (c) 2021, Sandhills Development, LLC
+ * @license   GPL2+
+ * @since     2.11
+ */
+
+namespace EDD\Gateways\PayPal\Exceptions;
+
+class Gateway_Exception extends \Exception {
+
+	/**
+	 * More specific message, used for recording gateway errors.
+	 *
+	 * @var string
+	 */
+	private $debug_message;
+
+	/**
+	 * Gateway_Exception constructor.
+	 *
+	 * @param string $message       Exception message. This might be vague, as it's usually presented to the end user.
+	 * @param int    $code          Error code.
+	 * @param string $debug_message More detailed debug message, used when recording gateway errors.
+	 *
+	 * @since 2.11
+	 */
+	public function __construct( $message = '', $code = 0, $debug_message = '' ) {
+		$this->debug_message = $debug_message;
+
+		parent::__construct( $message, $code );
+	}
+
+	/**
+	 * Records a gateway error based off this exception.
+	 *
+	 * @param int $payment_id
+	 *
+	 * @since 2.11
+	 */
+	public function record_gateway_error( $payment_id = 0 ) {
+		$message = ! empty( $this->debug_message ) ? $this->debug_message : $this->getMessage();
+
+		edd_record_gateway_error(
+			__( 'PayPal Gateway Error', 'easy-digital-downloads' ),
+			sprintf(
+			/* Translators: %d - HTTP response code; %s - Error message */
+				__( 'Response Code: %d; Message: %s', 'easy-digital-downloads' ),
+				$this->getCode(),
+				$message
+			),
+			$payment_id
+		);
+	}
+
+}

wp-content/plugins/easy-digital-downloads/includes/gateways/paypal/exceptions/class-invalid-merchant-details.php

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+<?php
+/**
+ * Thrown if merchant details are supplied, but invalid.
+ *
+ * @package   easy-digital-downloads
+ * @copyright Copyright (c) 2021, Sandhills Development, LLC
+ * @license   GPL2+
+ * @since     2.11
+ */
+
+namespace EDD\Gateways\PayPal\Exceptions;
+
+class InvalidMerchantDetails extends \InvalidArgumentException {
+
+}

wp-content/plugins/easy-digital-downloads/includes/gateways/paypal/exceptions/class-missing-merchant-details.php

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+<?php
+/**
+ * Thrown if there are no merchant details at all
+ *
+ * @see \EDD\Gateways\PayPal\MerchantAccount
+ *
+ * @package   easy-digital-downloads
+ * @copyright Copyright (c) 2021, Sandhills Development, LLC
+ * @license   GPL2+
+ * @since     2.11
+ */
+
+namespace EDD\Gateways\PayPal\Exceptions;
+
+class MissingMerchantDetails extends \Exception {
+
+}