Send custom invoice number to PayPal

[MrMooky]

Is there any way to send a custom invoice number to PayPal? That number should be available in the transactions export.

I tried a few different parameter names like invoive_number, invoiceNumber, invoiceNo and a few others I could think of and found in some StackOverflow posts.

I also tried to add a custom parameter via ->setParameter(), but that just threw an error so I guess it's not possible either.