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Hello @Bruno de Lima Costa Thanks for taking the time to bring this to the WHMCS Community. Under certain circumstances, we have identified this as an issue and have an open case for it #WHMCS-27811 Rest assured, it is active with our developers. While I am unable to confirm when this will be resolved, I would recommend monitoring the changelogs for the above Case ID.

Welcome aboard, Saleh! Awesome that you're diving into WHMCS and WordPress add-ons — that's a great niche to specialize in. Quick tips: get yourself a staging WHMCS install so you're not testing against live sites, dig into the hooks system early (it'll save you headaches later), and keep an eye on the module queue/admin log when things act weird. Good luck getting started — post here anytime, folks around here are pretty helpful.

Here again, any update?

We run WHMCS behind a handful of our own product sites, and the same thing kept happening. Someone reads the pricing page on WordPress, clicks Order, and lands on a billing portal that looks nothing like the site they were just on. A fair number of them never come back. So we built a WordPress plugin to keep the whole flow on one site. We have now open sourced it under GPL-2.0. What it does You drop a [whmcs_checkout] shortcode on a page. The plugin reads your product groups and products from the WHMCS API, caches them for an hour, and renders a pricing grid plus a one page checkout. Payment is taken inline with PayPal, in sandbox or live mode. Once payment clears it calls AddClient and AddOrder, so you end up with a real client and a real order in WHMCS, and the buyer lands on a confirmation page with their login details. Bits you might care about Monthly through triennial billing cycles, plus setup fees, read live from WHMCS Deep link straight into one product with ?pid= An optional add-ons step and an annual support line item Social signup with Google, Facebook and LinkedIn, so buyers can skip the registration form Per product overrides in wp-admin for featured flags and feature bullets, so your pricing table reads the way you want without editing anything in WHMCS Updates show up in wp-admin straight from the GitHub releases, so you do not need a separate updater plugin Requirements WordPress 6.0 or newer, PHP 7.4 or newer, a WHMCS install with API credentials, and a PayPal REST app if you want inline payment. Where to get it Source and issue tracker: https://github.com/ictinnovations/checkout-for-whmcs Composer: ictinnovations/checkout-for-whmcs It has been running on our own sites for a while and has taken real orders, but test it against a staging WHMCS before you point it at production. If something breaks, open an issue on GitHub and I will take a look. Happy to hear what is missing too.

Client has a small overpayment. It was added as a transaction and the next invoice was paid using it. The invoice is marked as paid, but the line says this in the email: Credit Applied: $0.00 USD. The ledger on the invoice shows it was applied, but strangely: Type: Client Account Debit, with "Applied Credit Note funded by Client Credit" for the description. As far as the client could see, it was paid, but no idea how. My clients don't typically log in and review, but just look for the email. This used to work back in the day, quite simply. Now it's confusing for admins, and worse, clients. Can it be made to show this (latest version WHMCS)? Not seeing any merge fields that might do it.

Fun. Looks like it may be just the one client has the error, but don't see how this will help resolve the confusion.

There is no way we have found. Occasionally customers double pay the same invoice. In v8 it would put the account in credit, then the credit balance would get used and shown on the invoice (not as the transaction at the bottom). v9 has changed this behaviour. And transactions are applied different ways and shown differently in the emails and PDFs Have you tried viewing the client account statement?

I just had Claude.ai help me create a module and hook to allow me to click a button to revert the invoice back to Draft and it also allows me to click a button to zero out a late fee. I am all set.