We are using ZohoApi's to connect pabbly and Zoho Books to add an attachment which are not available in regular conenctions of Zoho Books Connection provided in Pabbly.

For that we are adding Authentication Token in the header but those keys are valid only for 1 hour which makes it difficult for us to create a flow of events in Pabbly. 

How can we create a permanent authenticator so that we can create a flow in pabbly or is there any other way for doing it as well.

Thanks in advance