For each completed WooCommerce order, give the product author 1 point for each product they sell. If the order is refunded, take those points away. Note that this will only run once per order.

reward-woo-owners-with-points

/**
 * Reward Store Sales
 * @version 1.0
 */
function mycred_pro_reward_store_sales( $order_id ) {

	// Prevent crashes if myCRED gets disabled
	if ( ! function_exists( 'mycred' ) ) return;

	// Get order
	$order = wc_get_order( $order_id );

	// Give 1 point x quantity under the reference "store_sale"
	mycred_pro_run_for_order( $order, 1, 'store_sale', 'New completed order' );

}
add_action( 'woocommerce_payment_complete', 'mycred_pro_reward_store_sales' );

/**
 * Deduct Store Refunds
 * @version 1.0
 */
function mycred_pro_deduct_store_refund( $order_id ) {

	// Prevent crashes if myCRED gets disabled
	if ( ! function_exists( 'mycred' ) ) return;

	// Get order
	$order = wc_get_order( $order_id );

	// Take 1 point x quantity under the reference "store_sale_refund"
	mycred_pro_run_for_order( $order, -1, 'store_sale_refund', 'Refund of order' );

}
add_action( 'woocommerce_order_refunded', 'mycred_pro_deduct_store_refund' );

/**
 * Run myCRED for Woo Order
 * @version 1.0
 */
function mycred_pro_run_for_order( $order, $amount, $reference = '', $entry = '' ) {

	// Prevent crashes if myCRED gets disabled
	if ( ! function_exists( 'mycred' ) ) return;

	$items = $order->get_items();

	// Loop through items in order
	foreach ( $items as $item ) {

		$product_id    = absint( $item['product_id'] );
		$variation_id  = absint( $item['variation_id'] );

		// For variations we need to get the parent product
		if ( $variation_id > 0 ) {
			$product    = get_post( $variation_id );
			$product_id = $product->post_parent;
		}

		// Get product owner
		$product       = get_post( $product_id );
		$product_owner = $product->post_author;

		// Get myCRED
		$mycred        = mycred();

		// If owner is not excluded give points
		if ( ! $mycred->exclude_user( $product_owner ) ) {

			// Multiply by the quantity amount
			$amount = $amount * $item['qty'];

			// Make sure we only do things once for each order
			if ( ! $mycred->has_entry( $reference, $order_id, $product_owner, $product_id ) )
				$mycred->add_creds(
					$reference,
					$product_owner,
					$amount,
					$entry,
					$order_id,
					$product_id
				);

		}

	}

}