Allow the endpoint to receive array of JSON, instead of individual JSON Objects

[ShredNek]

Hello!

I have been using this app for a while now, and I only just realised recently you have an endpoint to generate invoices, which is fantastic!

I am wondering if it would be possible for you guys to add a feature to the endpoint to potentially take an array of JSON objects rather than just one? Saving users from having to send multiple requests if they want to smash out a few invoices for the day.

My apologies if I've missed this feature. Thanks again for everything you guys have done! :)