Joomla 4 & VirtueMart Subscription Control

We are looking to implement a subscription-based access control system for our Joomla 4 website using VirtueMart 4.2.0. The goal is to grant customers access to specific pages on the site after they have made a payment, for a designated subscription period. Current Situation: We have an existing setup with an outdated and malfunctioning module (mod_opentools_vmassign_groups_v1.2) and a VirtueMart plugin (plg_opentools_vm_buyer_assign_group_v1.6.2), which are not functioning as needed. Required Services: Review and assess the current subscription and access control modules and plugins on our Joomla site. Propose and implement a working solution for subscription-based access control that integrates with VirtueMart 4.2.0. The solution should allow for automatic access to specific pages post-purchase based on the duration of the subscription bought by the customer. Ensure the solution is fully compatible with Joomla 4 and scalable for future updates. Provide a simple mechanism for the admin to manage subscriptions and access rights. Include proper documentation for the implemented solution and any necessary training for our staff. Candidate Requirements: Proven experience with Joomla and VirtueMart, especially in implementing access control and subscription systems. Ability to debug and improve existing Joomla/VirtueMart extensions or develop new ones as needed. Strong communication skills and ability to provide clear documentation. Must present a portfolio of previous work that demonstrates relevant experience. How to Apply: Please provide a brief proposal outlining your approach to the task, including any necessary steps, estimated time to complete, and cost. References or examples of previous similar work are highly appreciated.