Integration of Email Functionality into WPdatatables Plugin on WordPress

Please check the files attached to learn more about the project scope. I am looking for a skilled freelancer to assist in enhancing the functionality of the WPdatatables plugin on my WordPress site. The plugin is already installed and configured to use a Google Sheets document as its database. The core requirement of this project is to integrate a robust email feature within the table. Key Project Requirements: Email Integration: Develop a system where users can sign up directly from the WPdatatables interface to receive email notifications. Notification Options: Users should have the option to receive notifications a) on-demand, whenever I choose to send out information, and b) on a monthly automated basis and c) once a certain threshold in one of the data included in the database is reached Email Template Design: The email should be based on a predefined template. Dynamic Content from Database: The template should be capable of pulling specific data from the database. -The logic involves selecting the three highest values from the table and incorporating them into the email, along with associated logos and supplementary text. -For the on demand version, I want to be able to send out a custom e-mail at a point of time I choose. -And for the threshold option, the user should be able to define a certain threshold, once reached, an email should get sent again pulling data from the table. User-Friendly Interface: The solution should be seamless and user-friendly, ensuring that the sign-up process and email receipt are straightforward for the end users. Ideal Candidate: Proficiency in WordPress and experience with WPdatatables plugin. Strong background in database management, particularly with Google Sheets integration. Experience in developing custom email functionalities and templates. Ability to implement logic for data selection and presentation in emails. Attention to detail and a focus on creating a seamless user experience. Additional Requirement: There are in total 4 databases (Google Sheets) with four different tables which require a slightly different opt-in with slightly different features, as can be seen in the attached file. Project budget is 250$ - please only apply if this is suitable for you.