Where to review API request logging, as applicable?

Odoo keeps a log of every request it sends to TaxJar successfully, together with TaxJar’s response. To open it, activate the developer mode, then go to Invoicing/Accounting ‣ Configuration ‣ TaxJar ‣ Logs.

TaxJar Logs list.

Note

Requests that fail are not logged. The error message from TaxJar is shown on screen instead. If an invoice fails to export, the message is also saved in a TaxJar Export Error activity on the invoice.