Firebase Cloud Function schedule to create document-CodePudding

We have a Flutter project with Firebase setup we would like to create a Firebase cloud function with node js that perform the following:

Every 27th of any month check the subscription date from the subscription collection. And create a new document in invoices collection then finally send an email & FCM with a payment URL.

CodePudding user response：

For that you need to use a scheduled Cloud Function.

More precisely, you need to:

Schedule the Cloud Function as desired, for example with 0 0 27 * *, i.e. at 00:00 on day-of-month 27.
In the Cloud Function, query your Firestore collection for "checking the subscription dates"
In the Cloud Function, send an email. For example through the Trigger Email extension. it's actually just a matter of creating a doc in a Firestore collection, see this article for more details.
In the Cloud Function, send the FCM as explained here in the doc.

For the last 3 points, you need to use the Admin SDKs since you are coding in a Cloud Function. (Doc for Firestore and doc for Messaging)