I want to write a web page to send text messages to mobile phones. How to do it?

Take Beidou SMS as an example. The steps to send text messages to mobile phones using web pages are:

Register and log in to the web version, PC or APP of Beidou SMS platform;

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Then import the number that needs to be sent, as shown in the picture;

Edit the text message content, detect and modify keywords and sensitive words;

Finally, click Send.