Ulysses Reeves Posted October 12, 2021 Share Posted October 12, 2021 Please, I am struggling with making an Upgrade of service via API only, i am obliged to Mark the invoice as Paid from WHMCS so that the upgrade can be applied, i tried to use api command "UpdateInvoice" but it have no impact to the changing the current product of the client. What is the best way to make a free upgrade via API ? 0 Quote Link to comment Share on other sites More sharing options...
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