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Is there any way to make an upgrade via API only


Ulysses Reeves

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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 ?

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