Check to add account funds at the processing order status

account-funds.php

add_action( 'woocommerce_order_status_processing', 'wc_ninja_add_funds_at_processing', 5 );
function wc_ninja_add_funds_at_processing( $order_id ) {
	if ( method_exists( 'WC_Account_Funds', 'add_funds' ) ) {
		wc_ninja_maybe_increase_funds( $order_id );
	}
}

function wc_ninja_maybe_increase_funds( $order_id ) {
	$order          = wc_get_order( $order_id );
	$items          = $order->get_items();
	$customer_id    = $order->get_user_id();

	if ( $customer_id && ! get_post_meta( $order_id, '_funds_deposited', true ) ) {
		foreach ( $items as $item ) {
			$product = $order->get_product_from_item( $item );
			if ( ! is_a( $product, 'WC_Product' ) ) {
				continue;
			}

			$funds = 0;
			if ( $product->is_type( 'deposit' ) || $product->is_type( 'topup' ) ) {
				$funds = $item['line_total'];
			} else {
				continue;
			}

			WC_Account_Funds::add_funds( $customer_id, $funds );

			$order->add_order_note( sprintf( __( 'Added %s funds to user #%d', 'woocommerce-account-funds' ), wc_price( $funds ), $customer_id ) );

			update_post_meta( $order_id, '_funds_deposited', 1 );
		}
	}
}