'Clickatell messages only delivered when message contains word "test"

I've set up a Sandbox SMS environment using the new API and I have registered a test phone number. I'm successfully sending messages but only messages with the word "test" are being delivered.

Is this a requirement of the Sandbox environment?



Solution 1:[1]

In my case not. I was trying to delete words Test+message+text, and all works fine. My SMS request looks like so:

https://platform.clickatell.com/messages/http/send?apiKey=FeKBZwZ3T2q3BNcjsJvHCA==&to=1234567&content=How are you Darko?

After I paste this into my Chrome web browser, I got the message with content "How are you Darko?"

Sources

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Source: Stack Overflow

Solution Source
Solution 1