Randomize those api and do not use same api again and again also rotate api

The code returns the following error:

Invoice creation error: You cannot combine currencies on a single invoice. This invoice has invoice items currency usd that conflicts with the invoice currency eur.

  at createSingleInvoice (/app/actions)
  at async createAndSendInvoice (/app/actions)
  at async handleSubmit (/app/page)

Revise the code to address the error.

I was previewing: /