MightyText CSV Batch Sender

I have a comma-separated CSV that lists one text message per row. I want a small script or utility that reads that file, talks directly to the MightyText Chrome extension (or to the companion MightyText web app if that is cleaner), and pushes the messages out in batch mode rather than firing them all at once.

Here is what I need delivered:
• A working script (Python, Node.js or similar) that authenticates, hands each message off to MightyText, and pauses between configurable batch sizes.
• Clear setup notes so I can drop in a new CSV, set the batch size / delay, and run it again without touching code.
• Any browser-automation helpers you use (e.g., Selenium, Puppeteer) packaged or documented, plus a quick readme outlining required Chrome flags or extension settings.

If an API key or token is needed you can assume I will supply it; just show me where to paste it. I can test on my end as soon as you hand over the first working build.