Provider Setup

Twilio

Key	Description
twilio.accountSid	Twilio account SID
twilio.authToken	Twilio auth token
twilio.fromNumber	Sender number in E.164 format

AWS SNS

Key	Description
aws.region	AWS region, for example us-east-1
aws.accessKeyId	IAM access key ID
aws.secretAccessKey	IAM secret access key

The IAM principal needs only sns:Publish. Publishing to a phone number is not scoped to a topic ARN, so the resource is *:

{
  "Version": "2012-10-17",
  "Statement": [
    { "Effect": "Allow", "Action": "sns:Publish", "Resource": "*" }
  ]
}

Credentials come from these three settings only; instance profiles, IRSA and the other AWS credential providers are not used.

Two AWS-side settings commonly look like plugin failures:

• new accounts sit in the SMS sandbox, where messages only reach phone numbers you have verified — request production access before rolling out
• SNS enforces a monthly SMS spending limit, USD 1.00 by default, after which publishes fail

Vonage

Key	Description
vonage.apiKey	Vonage API key
vonage.apiSecret	Vonage API secret
vonage.fromNumber	Sender ID or number

Telegram

Key	Description
telegram.bot.token	Telegram bot token
telegram.contact.attribute	User attribute that stores the chat ID

WhatsApp

Key	Description
whatsapp.api.url	API endpoint used to send messages
whatsapp.api.token	API token
whatsapp.from.number	Sender number
whatsapp.contact.attribute	User attribute for the recipient number

Signal

Key	Description
signal.cli.rest.url	Base URL of signal-cli-rest-api
signal.from.number	Sender number
signal.contact.attribute	User attribute for the recipient number