Freeagent to Textlocal via Zapier

Hi

Trying to send a text message to the customer when an invoice is produced.

With Zapier I can get it to add a contact to the address book of Textlocal and with this it exposes the customer’s address, mobile tele etc via Freeagent but with Send SMS Freeagent will only expose the the Invoice details. When it exposes the contact it is an api url which Zapier does not go and follow to gain the other fields, namely Mobile.

HAs anybody had this or a similar issue and knows how to get Zappier to follow the api url and get the data so that when it sends out it actually has the mobile number to use!?