Messaging API Integration Guide for SaaS & ERP — REST, Webhooks & Sandbox

What You Can Integrate

OTP API

Login/2FA, triggered via REST call, verified via a second endpoint.

WhatsApp API

Notifications, alerts, and two-way interaction via webhook.

Bulk SMS API

Event-triggered and scheduled sends for ERP alerts.

Email API

Transactional email, isolated from marketing-email infrastructure.

IVR API

Call routing configuration and webhook-based outcome logging.

Quick Answer — Messaging API Integration Guide for SaaS & ERP

MetaReach's API integration for SaaS/ERP platforms covers OTP, WhatsApp, Bulk SMS, Email, and IVR — all REST/JSON, authenticated via API key, with webhook callbacks and a sandbox environment for testing before going live.

Authentication & Setup

API credentials — issued during onboarding, includes a sandbox key
DLT sender-ID registration — required before production SMS/WhatsApp sends
Webhook endpoint registration — for delivery status, inbound replies, and call/lead events

Sandbox & Testing

A sandbox environment is available before production access — test OTP flows, notification templates, and webhook handling without sending to real numbers. Typical integration timeline for a basic OTP + notification setup: 1-3 weeks for a team familiar with REST APIs; multi-channel orchestration or IVR routing logic takes longer.

Multi-Tenant Considerations

For platforms serving multiple business customers, per-tenant configuration (independent sender IDs, templates, and settings) is supported — important for SaaS platforms where each customer needs their own brand identity in outbound messages.

Go Further

Beyond the Integration Guide

The non-technical side of each API this guide covers.

OTP Authentication API

Overview of login/2FA OTP for SaaS platforms.

Explore OTP Authentication API

WhatsApp API for SaaS Notifications

In-app alerts and updates delivered via WhatsApp.

Explore WhatsApp Notifications

Bulk SMS for ERP Alerts

Invoice, inventory, and HR/payroll alerts at scale.

Explore ERP Alerts

Email API for Transactional Emails

Password resets, receipts, and system alerts.

Explore Transactional Email

IVR for SaaS Customer Support

Voice-based support routing and escalation.

Explore IVR for Customer Support

SaaS & ERP Use Cases

See how SaaS platforms and ERP providers use this infrastructure.

View Use Cases

MetaReach API Docs

General API documentation covering the full MetaReach messaging platform.

View API Docs

Scripting & Templates

Sample templates and scripts for common messaging workflows.

View Scripts

Astrology Platform API Integration Guide

Cross-vertical reference — astrology platforms are technically SaaS products too.

View Astrology Integration Guide

White-Label Messaging for SaaS Resellers

Resell this infrastructure under your own brand.

Explore White-Label Options

Need the rest of the SaaS & ERP communication stack? See the SaaS & ERP Messaging Solutions pillar for OTP, WhatsApp, SMS, Email, and IVR in one place.

Common Questions

Frequently Asked Questions

Is sandbox testing available before DLT registration?

Yes — sandbox testing doesn't require DLT registration, which is only needed before production sending.

Can I integrate just one API (e.g., only OTP) without the others?

Yes — each API can be integrated independently based on your platform's needs.

Does this support multi-tenant configuration?

Yes — different business customers on your platform can have independent sender IDs and templates.

How long does a full multi-channel integration typically take?

A single-channel integration (e.g., just OTP) typically takes 1-2 weeks; full multi-channel orchestration across OTP, WhatsApp, SMS, and IVR can take 4-6 weeks depending on complexity.

Messaging API Integration Guide for SaaS & ERP Platforms