What programming language can I use?

Our HTTP API is very easy to integrate. No matter what programming language you use, it is as easy as fetching an URL.
All programming languages like PHP, Go, Ruby, C#, .net, Java, Pascal and many more are able to use BudgetSMS.

SMS HTTP API Documentation

• I got an error, what does it mean?
• What programming language can I use?
• Where can I download the BudgetSMS HTTP API specification?