Send an SMS using MSG91

1. Workflow Overview

This workflow is designed to send an SMS message using the MSG91 SMS gateway. It is triggered manually and then executes a single action block that sends an SMS through MSG91's API. This workflow is suitable for use cases where a user wants to test or manually send SMS messages via MSG91 within n8n.

Logical blocks included:

1.1 Manual Trigger: Initiates the workflow on demand.
1.2 SMS Sending: Sends an SMS via MSG91 API using provided credentials and message parameters.

2. Block-by-Block Analysis

1.1 Manual Trigger

Overview:
This block provides a manual entry point to start the workflow. It waits for the user to initiate execution.
Nodes Involved:
- On clicking 'execute'
Node Details:
- Node Name: On clicking 'execute'
- Type: Manual Trigger
- Role: Triggers workflow execution on user command
- Configuration: No parameters required; simply waits for manual start
- Key expressions/variables: None
- Input/Output: No input; output connected to "Msg91" node
- Version Requirements: Compatible with n8n core version supporting manual trigger node (version 1 or later)
- Potential Failure Modes: None (manual trigger is straightforward)
- Sub-workflow: None

1.2 SMS Sending via MSG91

Overview:
This block sends an SMS message using the MSG91 node configured with necessary parameters and credentials.
Nodes Involved:
- Msg91
Node Details:
- Node Name: Msg91
- Type: MSG91 SMS Node
- Role: Sends SMS messages using MSG91 API
- Configuration Choices:
  - To: Empty string (user must fill with recipient phone number)
  - From: Empty string (user must fill with sender ID)
  - Message: Empty string (user must enter SMS content)
- Credentials: MSG91 API credentials must be set up and linked to this node
- Key expressions/variables: None by default; user can replace empty strings with expressions or static values
- Input: Receives trigger from manual trigger node
- Output: Outputs response from MSG91 API about SMS send status
- Version Requirements: Compatible with MSG91 node version 1 or later
- Potential Failure Modes:
  - Authentication failure due to invalid or missing API credentials
  - Network timeout when calling MSG91 API
  - Invalid phone number or message causing API rejection
  - Missing required parameters (To, From, Message) resulting in error
- Sub-workflow: None

3. Summary Table

Node Name	Node Type	Functional Role	Input Node(s)	Output Node(s)	Sticky Note
On clicking 'execute'	Manual Trigger	Initiates workflow	None	Msg91
Msg91	MSG91 SMS Node	Sends SMS via MSG91 API	On clicking 'execute'	None	Sending an SMS using MSG91

4. Reproducing the Workflow from Scratch

Create Manual Trigger Node
- Add a new node of type Manual Trigger.
- This node requires no parameters. It will be the starting point of the workflow.
Add MSG91 Node
- Add a new node of type MSG91 SMS.
- Configure the following parameters:
  - To: Enter the recipient phone number in international format (e.g., +919999999999).
  - From: Enter the sender ID registered with MSG91 (alphanumeric or numeric sender ID).
  - Message: Enter the SMS content text to send.
- Set up the MSG91 API Credentials in n8n Credentials section:
  - Create new MSG91 API credentials with your MSG91 API key.
  - Link these credentials to the MSG91 node.
Connect Nodes
- Connect the output of the Manual Trigger node to the input of the MSG91 node.
Save and Activate Workflow
- Save the workflow.
- Optionally, activate it for scheduled or event-based triggering.
- For manual execution, use the "Execute Workflow" button.
Test Sending SMS
- Click "Execute Workflow" manually to trigger the SMS sending.
- Monitor the MSG91 node output for success or error messages.

5. General Notes & Resources

Note Content	Context or Link
MSG91 is a reliable SMS gateway service commonly used for transactional SMS	https://msg91.com
Ensure phone numbers are in E.164 international format for MSG91 compatibility	MSG91 API Documentation
n8n MSG91 node requires valid API credentials to function	n8n Credentials configuration for MSG91

This document fully describes the "Send an SMS using MSG91" workflow, enabling users to understand, reproduce, and maintain it efficiently.

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