It resolve onboarding link for Stripe Express accounts.
### How this function works
This function resolves a new Stripe Express Onboarding Link. It will use the authenticated **uid** to fetch the account data from **STRIPE_ACCOUNTS_COLLECTION_PATH/{uid}**
### Requirements
* You can only create new accounts if you've signed up for Stripe Connect, which you can learn how to do at https://stripe.com/docs/connect.
### Function details
To install this function you need to enter the values of the following environment variables:
* STRIPE_SECRET_KEY: Your Stripe secret API key. See https://stripe.com/docs/keys.
* STRIPE_ACCOUNTS_COLLECTION_PATH: The collection path where the Stripe accounts are stored.
### Resources
* [Stripe Express Accounts](https://stripe.com/docs/connect/express-accounts)