<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\GroupedProduct\Model\Product\Type\Grouped">
        <plugin name="bluejalappeno_tieredpricing_grouped_product_type_grouped_plugin"
                type="Bluejalappeno\TieredPricing\Plugin\Grouped\GroupedProductPlugin"
                sortOrder="10"
                disabled="false"/>
    </type>
    <preference for="Magento\Quote\Model\PaymentMethodManagement" type="Bluejalappeno\TieredPricing\Model\Quote\PaymentMethodManagementOveride" />
</config>