Wordpress batch export plugin

General information for the website: online subscription website with monthly batch process, with option to include add-on products
Kind of development: Customization of existing website
Num. of web pages/modules: 2 plugins
Description of every page/module: Timing: Next 2 weeks

EXISTING FUNCTIONALITY

Mailpoet plugin: includes a custom Batch Export File process
Involves a customer table update routine based on subscribers with a current subscription order, and one batch file export routine of resulting data. (this data used in a payment gateway batch process to process credit card tokens)

Batch Results Upload plugin
Takes the CSV output of the payment process and imports it into the system
Auto-sends receipts out via email routine based on the uploaded CSV file.
Outputs a batch file (on request) of the most recent batch into a spreadsheet (for the Fulfilments/Delivery company).
Description of requirements/features: 1) Move Batch Export File functionality in Mailpoet to a new custom plugin based on the functions/classes in Visser's Store Exporter Deluxe.

2) Additional Features to be added to the Batch Export File plugin include:
- update the new Batch Export File plugin to include a flag for an add-on product (once a month customers click on a button to 'opt-in' to an extra product)
- update the new Batch Export File plugin to include an option for other 'normal' Woocommerce products (other than the subscription) which were ordered during the month t be processed by a similar batch export file.


2) Batch Results Upload plugin
- to be updated so it is doesn't clash with Visser's Store Exporter deluxe. Probably should be included in the new custom plugin
- upload process to be updated to include the 'normal' product orders in the current spreadsheet export (for the Fulfilments/Delivery company)
CMS and Admin requirements: Wordpress:
- Visser Store Exporter Deluxe
- existing custom batch upload plugin
Extra notes: