private function setConfig(): void 	{ 		$this->config = [ 			'mode' => $this->mode, // Can only be 'sandbox' Or 'live'. If empty or invalid, 'live' will be used. 			'sandbox' => [ 				'client_id' => $this->clientId, 				'client_secret' => $this->clientSecret, 				'app_id' => 'APP-80W284485P519543T', 			], 			'live' => [ 				'client_id' => $this->clientId, 				'client_secret' => $this->clientSecret, 				'app_id' => config('custom.paypal_live_app_id'), 			],  			'payment_action' => 'Sale', // Can only be 'Sale', 'Authorization' or 'Order' 			'currency' => 'EUR', 			'locale' => 'en_US', 			'validate_ssl' => true, 			'notify_url' => '', // Change this accordingly for your application. 		]; 	}