Creating automatically generated invoices for subscriptions at WordPress website using SlicedInvoice

I run a WordPress based website. The website offers 3 different membership plans. 2 of these membership plans come with a subscription which triggers a recurring payment after each billing cycle. A billig cycle is always 1 month. This works so far. The issue is now that I need to generate an invoice automatically each time when the renewal period will trigger a new payment. I bought the SlicedInvoice business package to accomplish the task. As it does not work out of the box I need some help on how to connect the plugin with the website. Do I need custom code for this? How can I generate automatically recurring invoices for the subscription plans?

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