I made two changes and it works for me.
1) I added the option to save the phone.
1.1) in the wpcf7_sendpress_subscribe_to_lists function I added the phonenumber entry in the user_data array.
I did the isset treatment.
1.2) then in the same function in the call SendPress_Data :: subscribe_user I passed the parameter phonenumber. And you also have to pass the Status = 2 parameter.
2) the wpcf7_add_shortcode call was discontinued. It has been replaced by wpcf7_add_form_tag. On line 10 of the file that is in the paste bin.
I do not know if it was the correct form, but for me it is working. I hope I have helped.
New code in: https://pastebin.com/R9zZia1h
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