Flow of payment gateway

I don't believe so. Likely just a minor issue in the query that view is using.

Nothing new about getting the updated QuickPay gateway into the CBSubs package ??

Looks better than the previous builds sent. Unsure why you're doing checksum validation in handleNotification as it's handled by _returnParamsHandler via _pspVerifySignature function call. Looks like your getSubscriptionRequstParams usage won't take into account different initial price from regular price (if period1 exists use mc_amount1 otherwise set price to mc_amount3). Aside from that there's not much I can suggest without reviewing Quickpay API further. As explained earlier this was not allotted for in my schedule when I scheduled tasks basically months in advance.

I've no idea when/if this will be implemented; we will of course have to make modifications, code cleanup, testing, etc.. It's not much different than contributing to a project on Github and is important to follow that projects code quality. For example you've completely altered the code style to your own and all of that will have to be cleaned up and redone.

With that said at a glance I don't see any security concerns so should be perfectly fine for you and your customers to use if it's working in your tests.

Hmmm, you write: "Looks like your getSubscriptionRequstParams usage won't take into account " - but it works with initial price?
I would like to alter the code style so that it matches your code style - but I need to know how you want it. I have been working in PHPStorm with this project.

For example is it something like this I must alter the code against : www.php-fig.org/psr/psr-12/ ?

Hmmm, you write: "Looks like your getSubscriptionRequstParams usage won't take into account " - but it works with initial price?

The 'amount' should be based off mc_amount1 if period1 exists otherwise it should be mc_amount3. This allows for different initial price/duration functionality to work (the scheduler will schedule the first renewal after initial duration if supplied). This should typically override mc_gross for the form. See CCBill for example.

I would like to alter the code style so that it matches your code style - but I need to know how you want it. I have been working in PHPStorm with this project.

Just follow the same styling as existing code. We don't have an official formatter for phpstorm.

I've finished a few tasks early and moved a few things around. Will be reviewing this further, making adjustments where necessary, and will see if we can have recurring payments for quickpay released sometime in the coming weeks.