Stripe Connect OAuth helpers.
Convenience module that delegates to StripeElixir.Services.OAuthService.
Usage
client = StripeElixir.client("sk_test_...", client_id: "ca_...")
# Build authorization URL
{:ok, url} = StripeElixir.OAuth.authorize_url(client)
# Exchange code for token
{:ok, resp} = StripeElixir.OAuth.token(client, %{"grant_type" => "authorization_code", "code" => "ac_..."})
# Revoke access
{:ok, resp} = StripeElixir.OAuth.deauthorize(client, %{"stripe_user_id" => "acct_..."})