Can't you find your payment's invoices for a Plan purchase on ShippyPro? Here where to look at!  🙌

If you paid: 

If you paid for the subscription to one of our Plans through your Shopify Account the invoice will automatically be sent by Shopify, VAT excluded.

In case you paid for the subscription to one of our Plans through your Shippypro account, you can find the invoice in Settings > Admin > Payments section.