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  • Developer’s Guide
    • Installing and using InterFAX from your environment
    • Registering and using a Developer account
    • Developer API FAQ
    • InterFAX API System Limitations
    • Fax Status/Error codes
    • Error handling with InterFAX API
    • InterFAX Simulator
    • Using InterFAX to send faxes
    • Using InterFAX to receive faxes
    • Which InterFAX API to use for sending faxes
    • Polling or callback – which to use
    • Poll for status of a previously-sent fax
    • Receive outgoing fax confirmations via callback to your web app
    • Poll for newly-received faxes
    • Receive notification of a newly-received fax via callback to your web app
    • Using InterFAX for PCI-DSS-compliant content
    • Using InterFAX as a user-facing fax server
    • Using InterFAX for production faxing purposes
    • Using InterFAX for time-sensitive content, such as online orders
    • Using InterFAX for privacy-sensitive content, such as patient information
    • Using InterFAX in off-the-shelf software to be sold to clients
    • Migration from Twilio
    • Salesforce Classic
    • Salesforce Lightning
  • API Documentation
    • REST API
    • SOAP API
    • SMTP Modifiers
  • SDK Documentation
    • Java Fax
    • .NET Fax
    • Python Fax
    • PHP Fax
    • Ruby Fax
    • NodeJS Fax
    • FAXCOMEXLib
    • ASP Classic
    • ASP Faxing Samples
    • ASP.NET Fax
    • C# Fax
    • ColdFusion
    • PERL Fax
    • VB Fax Code
    • VB.Net
API Documentation

InterFAX API Documentation

InterFAX REST API

Send Faxes from cURL or any standard HTTP library
View Documentation »

InterFAX SOAP API

Send Faxes from any SOAP-enabled Client
View Documentation »

SMTP Fax Modifiers

Send a fax programmatically through the InterFAX SMTP interface
View Documentation »