Which database is primarily used to generate the invoices – Xero or Salesforce (SF)?

Which database is primarily used to generate the invoices – Xero or Salesforce (SF)?

SFX supports two-way sync, i.e, you can create invoice from either Salesforce or Xero. As the data source is in Salesforce, SFX can retrieve all the data from your objects in Salesforce to create an Invoice