Add additional information for customer group on single product template

functions.php

add_action( 'woocommerce_single_product_summary', 'rbp_output_single_product_discount_information', 35 );

function rbp_output_single_product_discount_information() {

	$group = get_user_meta( get_current_user_id(), 'customer_group', true );

	if ( is_user_logged_in() === true && 'stammkunden' === $group ) {
		$product = wc_get_product( get_the_id() );

		if ( $product->is_type( 'variable' ) ) {

			$available_variations = $product->get_available_variations();
			$output               = false;

			foreach ( $available_variations as $variation ) {

				$rbp_config = get_post_meta( $variation['variation_id'], 'rbp_role_config' );

				if ( ! empty( $rbp_config && false === $output ) ) {
					foreach ( $rbp_config as $group ) {
						if ( 'stammkunden' == key( $group ) ) {
							echo '<p><b>Rabatt für Stammkunden</b><br>Unsere Stammkunden erhalten folgende Rabatte:<br>Ab 10 kg - 10% Rabatt<br>Ab 15 kg - 15% Rabatt</p>';
							$output = true;
						}
					}
				}
			}
		} else {
			$rbp_config = get_post_meta( get_the_id(), 'rbp_role_config' );

			foreach ( $rbp_config as $group ) {
				if ( 'stammkunden' == key( $group ) ) {
					echo '<p><b>Rabatt für Stammkunden</b><br>Unsere Stammkunden erhalten folgende Rabatte:<br>Ab 10 kg - 10% Rabatt<br>Ab 15 kg - 15% Rabatt</p>';
				}
			}
		}
	}
}