Upload the folder (BillingCycleUpdate) in route modules/addons, and the folder overrides in route lang.
If inside the folder lang al ready exists the folder overrides then just copy the code from the mods’ language files to the language files of the folder overrides.
Activate it, check who will have access and add the License key in Whmcs Admin.
Then go to Addons and choose BillingCycleUpdate.
In the Mod options we will see all our products, select the product or products you want to activate and click Add Product.
We do this in all products we want to activate.
Immediately after that it shows to your customers the option to be able to change the billing cycle or to issue an invoice and payit.
And the mod is ready!
Pay Attention to this: When a customer for some reason change the billing cycle and generate a new invoice but did not pay it and told you to cancel it because he repented and wants to pay as it was before, when he will go again to create an invoice he will not able to doit , and you should do the following.
You will go to phpMyAdmin and select from the database table (tblinvoiceitems) and delete the invoice number that was created by the customer.
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