Simple Point of Sale using WooCommerce & Contact Form 7 with CF7SendWA (https://solusipress.com/sistem-kasir-sederhana-dengan-woocommerce-dan-contact-form-7/)

cf7-additional-settings.tab

woo_checkout_first_name: your-name
woo_checkout_phone: whatsapp
woo_checkout_order_note: order-note

cf7-form.tab

[text your-name id:your-name "Guest"]
<table width="100%">
  <tr>
    <td>No&nbsp;WA</td>
    <td>[tel* whatsapp id:whatsapp-number placeholder "Nomor WA Customer"]</td>
  </tr>
  <tr>
    <td colspan="2">
      [textarea order-note placeholder "Catatan"]
    </td>
  </tr>
  <tr>
    <td>Uang&nbsp;Dibayar</td>
    <td>[number* total_paid id:paid-bill class:money "0"]</td>
  </tr>
  <tr>
    <td>Uang&nbsp;Kembali</td>
    <td>[number paid_change id:change-bill class:money "0"]</td>
  <tr>
</table>
[submit "Bayar Sekarang"]

cf7-whatsapp-body.tab

Toko UKM Sehat
Jl. Untung No 19. Jakarta
WA 08123456790

[woo-orderdetail]

Note:
[order-note]

pos-lite-snippets.php

<?php
add_action( 'wp_enqueue_scripts', 'solusipress_load_pos_lite_scripts', 999 );
function solusipress_load_pos_lite_scripts(){
	if( is_page( 'pos-lite' ) ) {
		wp_enqueue_script( 'sticky' );
	}	
}
add_action( 'woocommerce_email', function( $email_class ){
	if( isset( $_POST['total_paid'] ) ) {
		remove_action( 'woocommerce_order_status_pending_to_completed_notification', array( $email_class->emails['WC_Email_New_Order'], 'trigger' ) );
		remove_action( 'woocommerce_order_status_completed_notification', array( $email_class->emails['WC_Email_Customer_Completed_Order'], 'trigger' ) );		
	}
} );
add_filter( 'cf7sendwa_disable_woocommerce_email', function( $bool ){
	if( isset( $_POST['total_paid'] ) ) {
		$bool = true;
	}
	return $bool;
} );
add_filter( 'wpcf7_form_elements', function( $content ){
	$str_pos = strpos( $content, 'name="total_paid"' );
	if( $str_pos ){
    	$content = substr_replace( $content, ' data-bind="textInput: pos_bill_paid" ', $str_pos, 0 );
	}
	$str_pos = strpos( $content, 'name="paid_change"' );
	if( $str_pos ) {
    	$content = substr_replace( $content, ' data-bind="value: pos_bill_change" ', $str_pos, 0 );
	}
	return $content;
} );
function solusipress_set_cash_payment( $order, $cf7data ){
	if( isset( $_POST['total_paid'] ) ) {
		$order->set_payment_method( 'cash' );
		$order->set_payment_method_title( 'Cash in Store' );
		$order->set_status( 'completed', '', true );
	}	
}
add_action( 'cf7sendwa_before_woo_order_save', 'solusipress_set_cash_payment', 10, 2 );
add_action( 'wp_footer', 'solusipress_pos_module', 9999 );
function solusipress_pos_module(){
	if( is_page( 'pos-lite' ) ) {
?>
<style type="text/css">
	.wpcf7-form-control { margin-bottom:5px; width: 100%; color: #000; }
	.cf7sendwa-quickshop-checkout { max-height: 50vh; }
	.cf7sendwa-quickshop-checkout-container textarea { 
		min-height:0px;
		height: 100px;
	}
	#paid-bill, #change-bill { text-align: right; }
	#your-name { display:none!important; }
</style>
<script type="text/javascript">
	var pos_vm = Woo_QuickShop_Cart.getVM();
	Woo_QuickShop_Cart.prototype.pos_bill_paid = ko.observable(0);
	Woo_QuickShop_Cart.prototype.pos_bill_change = ko.pureComputed( function(){
		return this.pos_bill_paid() - this.total();	
	}, pos_vm );
	if( cf7sendwa.is_mobile == '1' ) {
		cf7sendwa_qsreview.sticky = "no";
	}
	(function($){
		$(document).ready( function(){
			$( '#whatsapp-number' ).val( '<?php echo get_option( 'cf7sendwa_number', '' ); ?>' );
			$( '#form-pos-lite' ).sticky({topSpacing:20});	
			$( '#change-bill' ).attr('readonly', true);
			$( '.money' ).focus( function(){
				$(this).select();
			} );
			$( '#whatsapp-number' ).click( function(){
				var input = this;
				input.focus();
				input.setSelectionRange(0,999); 				
			} );
			Hooks.add_filter( 'cf7sendwa_checkout_order_item', function( txt, options ){
				var paid_bill = $.number( pos_vm.pos_bill_paid(), cf7sendwa.decimals, cf7sendwa.decimal_separator, cf7sendwa.thousand_separator );
				var bill_change = $.number( pos_vm.pos_bill_change(), cf7sendwa.decimals, cf7sendwa.decimal_separator, cf7sendwa.thousand_separator );
				var additionals = 'Bayar : Rp ' + paid_bill + "\n" +
					'Kembali : Rp ' + bill_change;
				txt = txt + "\n" + additionals;
				return txt;
			} );
			$( '.wpcf7-submit' ).click( function( evt ){
				if( pos_vm.pos_bill_change() < 0 ) {
					alert("Pembayaran kurang");
					evt.preventDefault();
				}
			} );
		} );
	})(jQuery);
</script><?php
	}
}

post-pos-lite.html

<div class="grid-60">
<input type="text" id="cf7sendwa_woo_text_filter" 
       style="width:100%; margin-bottom: 25px;"
       placeholder="type to search">
[cf7sendwa-quickshop]
</div>
<div class="grid-40">
[cf7sendwa-checkout sticky="yes" top="50" bottom="400"]
[contact-form-7-wa id="366" title="POS Lite"]
[/cf7sendwa-checkout]
</div>