Frustrating integration between EBAY_US and Zoho Books through Zapier

Frustrating integration between EBAY_US and Zoho Books through Zapier

Hi,

I'm having a hard time binding ebay_us and Zoho Books through Zapier.
  1. Create Customer doesn't provide a currency field. It just assumes it's EUR. 100% of ebay_us sales are made in $
  2. Create Invoice: Purchase order isn't listed, I'd like to populate that
  3. Create Invoice: Exchange rate field is just ignored when the invoice is created
  4. I can't populate custom fields
The list continues. Is there any way I could fork a given Zap and suit it to my needs? Or is it Zoho crew's responsability?

Thanks