A: Yes. BreezeDoc has a REST API you can plug into your app. You can authenticate with OAuth 2.0 or a personal access token and make calls with Authorization: Bearer <token>
From your dashboard you can create a document and then send it to its recipients via POST /documents/{document}/send, which triggers the signing flow on your users’ behalf
You can also create docs from templates and monitor team signing activity if you need reporting or a custom status view

(Heads-up: the current rate limit is 60 requests/minute.)