Api id value retrieve

Hello,

I have an api from stripe
https://api.stripe.com/v1/accounts — This api create the account but the extension will be missing. That is why I need to add the person info also.

I am trying to extend the api1 to api2 https://api.stripe.com/v1/accounts/{{id_of the previous api}}/persons.

The problem is that when I use repeat element to get the id of the previous api. It is not working.
I am trying to use the id of the previous api to submit all the form in once. I hope someone can guide me. If you need more or better explanation. Please let me know.