API Developer Hub

Available APIs

Messaging APIs & Integration Guides

Choose the documentation for your channel. Authentication, account activation, credit balances and supported examples vary by API; check the linked guide before integrating.

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SMS Gateway API

Bulk SMS & 2FA API

HTTPS GET/POST SMS sending, balance check, delivery report webhook, OTP generation and verification — with code samples in 8 languages.

HTTPS GET/POST SMS Send API Balance Check 2FA / OTP API Delivery Reports SMS Scheduler

Malaysia SMS API Documentation → SMS API Docs → 2FA API Docs → Postman Guide →

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WhatsApp Business API

WABA API

Send WhatsApp template messages, OTP/TAC, media, and interactive messages via REST API — with full Postman collection and webhook support.

Send Templates OTP via WhatsApp Rich Media Webhook Replies Interactive Messages Automated Workflows

WABA API Docs → Postman Guide → Automated Workflows →

Meta Messenger API

Facebook Page Messaging

Send text and files to eligible Page-scoped customer IDs using JSON. Receive inbound messages and delivery updates through webhooks. Messenger activation and separate credits are required; Meta messaging-window requirements apply.

HTTPS POST / JSON Page-scoped IDs Inbound Webhooks Delivery Callbacks

Messenger API Documentation → Messenger Features & Setup →

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Email SMTP API

Email API

Send transactional and bulk email via SMTP API endpoint — integrate using standard SMTP protocol with code samples in PHP, Java, NodeJS and more.

SMTP API Endpoint Transactional Email Bulk Campaigns Delivery Tracking Attachments Custom Sender Domain

Email API Docs → Integration Guide → Postman Guide →

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REST API Reference

REST & SMPP API

Full REST API reference, SMPP gateway documentation, and language-specific integration guides — for teams building high-volume messaging systems.

REST API Ref SMPP Gateway PHP · Java · C# VB.net · NodeJS ASP.NET · C++ Python

REST API Reference → SMPP Gateway Docs → HTTPS SMS API →

Code Samples

Code Samples in 8+ Languages

Browse the SMS integration examples below on bulksms.com.sg. Use the channel documentation above for WhatsApp, Messenger and email examples.

Languages: PHP Java C# VB.net NodeJS ASP.NET C++ Python

Guide	Description	Link
Send SMS with PHP	Step-by-step PHP code to send SMS via API	View Guide →
Send SMS with Java	Java integration guide with working code sample	View Guide →
Send SMS with C#	C# code sample for SMS API integration	View Guide →
Send SMS with ASP.NET	ASP.NET integration with full example	View Guide →
Send SMS with VB.net	VB.net code for bulk SMS sending	View Guide →
Send SMS with C++	C++ integration sample for SMS API	View Guide →
Check Balance (PHP)	How to check SMS credit balance via API	View Guide →
OTP Quick Guide	How to set up SMS OTP verification	View Guide →
Postman — SMS API	Test the SMS API using Postman	View Guide →
Postman — WABA API	Test the WhatsApp API using Postman	View Guide →
Postman — Email API	Test the Email API using Postman	View Guide →