Your account can be configured to automatically authenticate SMS messages based on an email address and IP address.
SMS Gateway API
Let Our API Help You Connect
SMS gateway API can transform your communication systems into an efficient and seamless operation. It serves as an intermediary between your CRM or other database and CompleteSMS.
- Take advantage of your company’s existing program infrastructure by combining it with the communication power of our SMS gateway API.
- Upload bulk mailing lists and message hundreds of clients and colleagues at once
- Receive automated SMS alerts for any server events
- Schedule SMS messages for any time in the future
- Send messages worldwide with our international network
SMS texting made easy with
the CompleteSMS API Solutions
With a short message service (SMS) gateway application programming interface (API), you can take advantage of your existing workplace databases to relay information via SMS. Today, a text message is often the easiest way to grab your recipients’ attention. With an SMS API integration, you can send pertinent information out without having to change applications, be that payment reminders, appointment notices, alerts or 2FA.
When you’re ready to integrate your existing software with an SMS gateway API, consult CompleteSMS to learn more about our services.
Business SMS API
Many organizations and industries can benefit from using SMS as a communication platform for organizations needing to send out reminders or alerts. When you’re developing new software for your university, car dealership or medical clients, integrating our SMS API gateway can help you build an efficient communication system, making it easy for your recipients to engage while saving time and money for your client to:
- Send appointment reminders to one person or a group of recipients.
- Alert customers of upcoming or due dates or overdue notices.
- Send pertinent information at a moments notice and trust it will be read.
- Keep communications all under one application for easy reference.
Special Features
With several key benefits, our SMS texting API solution can help your business or organization reach more recipients. Send messages swiftly and safely while maintaining the integrity and efficiency of your current operations.
Automatic Authentication
Push Replies
Replies can be sent straight to your API through an extensible markup language (XML) post to a specified web service.
Language Agnostic
CompleteSMS supports whatever language you need.
No Hardware Needed
A perfect solution for customer relationship management (CRM) SMS integrations.
Platform Flexibility
The CompleteSMS API solutions work on several platforms, including Windows and Uniplexed Information and Computing Service (UNIX).
White Label Interface
Need the SMS interface in your software to be seamless? We can add your logo and information to the admin/billing portal.
SMS Texting API Benefits
Your company can enjoy several benefits when using our easy-to-integrate SMS API from CompleteSMS.
SMS API integration allows for the automation of sending and receiving messages, eliminating the need for manual staff management. With automated messages, you can save your team a significant amount of time, which can help improve workflow efficiency and productivity.
An SMS API enables you to monitor your messaging efforts. With the software platform, you can see when messages reach the recipients. If they are not delivered, you can take the necessary steps to ensure they make it to their destination.
Our SMS APIs can be customized to meet your business’ needs and communication strategy. On top of integrating with almost any application you choose, the software has a host of features, such as bulk messages, to help enhance your messaging capabilities.
SMS allows you to send messages to targeted users at a greater scale with improved speed. Important messages, notifications or reminders can quickly reach your customers from any device. As a result, your business’ communication becomes faster, more reliable and consistent.


What is an API?
Application program interfaces (APIs) allow databases and applications to communicate with each other. For example, if a hot tub reseller wants to display the weather from their local news station on their website, they would use an API to request the information from the news station’s weather database to then display on their site. Similarly, if you wanted to send texts through your membership database software, you’d use our SMS gateway API to enable that functionality.
APIs also add a layer of privacy and protection as the go-between that never allows the two to directly interface with each other.
The CompleteSMS offers both, SMTP and HTTPS connections, giving you options when determining how to reach clients and customers faster than ever while giving your business an extra layer of privacy.
An SMS API is a software interface that integrates with your business’s existing systems or applications, enabling text messaging capabilities. The software intermediary allows two applications to communicate and work with each other so you can instantly send and receive messages from any website or computer application.
An SMS API can be integrated into almost any software or application using a dedicated API code. Integrating the API typically involves connecting one software with another through the programming interface to form a unified system.
The integration process differs depending on the SMS API provider and the software you use. CompleteSMS offers a seamless and quick integration designed to align with your methods, challenges and functional needs.
An SMS API acts as a channel for communication between your applications and the SMS platform. The software connects telecommunication carriers to the internet, eliminating the need for an additional platform or manual intervention to facilitate communication.
To start using an SMS API, you must integrate the software with your existing systems, such as a CRM, enterprise resource planning (ERP) or other tools. Once the integration is complete, API protocols enable automatic sending and receiving of messages as well as alerting to any errors that occur during the process.
For example, if a customer fills out a request form on your website, the inquiry goes directly to your CRM platform, which automatically sends an SMS back to the customer with the appropriate response.
- Seamless user experience: Integrating an SMS API with your current CRM allows your staff to stay focused on the task at hand, without having to bounce to another software to send and check messages.
- Messaging transparency: Using an SMS API provides message feedback, like delivery status or sending errors, thus giving you the opportunity to reach out again, or correct mistakes. Reporting also allows for overall messaging health check.
- Flexibility: Tailor your messaging needs to align with business goals and utilize features such as scheduling messages or message threading to save valuable time and enhance overall productivity.
Global Reach SMS Gateway
Our SMS texting API solution makes sending messages globally easier and more reliable. CompleteSMS has redundant routing options to get your messages delivered to the their intended recipient. Depending on the region, we can reroute messages to multiple downstream partners even if there’s an SMS traffic jam somewhere in the network.
All you have to do is tell us what countries to set up for you.
Talk to an Expert
Our SMS expert, John, will give you a full demo of our software and answer any questions you have.
Schedule Your Demo