Remove unused boleto methods and fix for single configured value

Gateway/Request/CheckoutDataBuilder.php

@@ -54,10 +54,8 @@ class CheckoutDataBuilder implements BuilderInterface
 	 */
 	protected $taxConfig;
 
-
     /**
      * CheckoutDataBuilder constructor.
-	 *
      * @param \Adyen\Payment\Helper\Data $adyenHelper
      * @param \Magento\Store\Model\StoreManagerInterface $storeManager
      * @param \Magento\Checkout\Model\Session $checkoutSession
@@ -156,7 +154,7 @@ class CheckoutDataBuilder implements BuilderInterface
             $request['shopperName']['lastName'] = $payment->getAdditionalInformation("lastName");
         }
 
-        if ($payment->getAdditionalInformation(AdyenBoletoDataAssignObserver::BOLETO_TYPE)) {
+        if ($payment->getMethod() == \Adyen\Payment\Model\Ui\AdyenBoletoConfigProvider::CODE) {
             $boletoTypes = $this->adyenHelper->getAdyenBoletoConfigData('boletotypes');
             $boletoTypes = explode(',', $boletoTypes);