India GST Invoicing for WHMCS
GST tax invoices from WHMCS: CGST + SGST or IGST worked out by state, GSTIN checks, SAC codes, financial-year invoice numbers and GSTR-1 exports.

Checkout.com for WHMCS connects your WHMCS to Checkout.com, the payment platform used by merchants across the Gulf, the UK and Europe. Your clients pay invoices on Checkout.com's hosted payment page.
Visa, Mastercard, American Express, mada, Apple Pay, Google Pay and the other methods enabled on your Checkout.com account. Card details never touch your server, and 3D Secure is requested for every payment.
When the client returns from Checkout.com, the module asks Checkout.com for the payment and credits the invoice only for a payment this WHMCS created, and only once. Add the signed webhook and invoices are also marked paid when the client closes the browser early.
Open the invoice, choose the transaction and press "Refund through Gateway" — in full or in part. No need to sign in to Checkout.com.
Invoices are charged in their own currency, or in the "Convert To For Processing" currency, including three-decimal currencies such as KWD, BHD and OMR, and are always credited in the invoice currency.
Upload the module, activate "Checkout.com" under Payment Gateways, paste your secret key and processing channel ID and save. A sandbox key takes test payments; switch to your live key when you are ready.
You need your own Checkout.com account. Clients pay each invoice on the Checkout.com page; cards are not stored for automatic recurring charges.
| Platform | WHMCS 8.0 or newer |
|---|---|
| PHP | 7.4 – 8.3 with cURL |
| API | Checkout.com Hosted Payments Page and Payments API, no bundled SDK |
| Account | Checkout.com account (secret key, processing channel ID) |
| Operations | payment, full and partial refund |
| Tested | payment, repeat return, signed webhook, another invoice's payment, currency conversion and refunds run against a simulator that answers in Checkout.com's documented format |
| Package | gateway module, .zip |
| Licence | one WHMCS installation |
Ask about compatibility or licensing. Need it to do something it doesn't? We build custom versions for a fixed quote.
GST tax invoices from WHMCS: CGST + SGST or IGST worked out by state, GSTIN checks, SAC codes, financial-year invoice numbers and GSTR-1 exports.
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