App is not defined when trying to save my code

Marketplace & Integration
3

Hi @gautham ,

I am trying to execute function for creating paymenyt link by using razorpay third party api.
When hitting Api through function ,used axios to call api.

Giving issue as app is not defined while I am using let response = await app.axios(config);

Please check step no:8 on below link:
Razorpay | yellow.ai.

Please provide solution on this, How to receive a response by hitting api through function.