docs: Create a guide on how to perform subscription upgrades

[rishi-raj-jain]

$75

as merchants and as customers

(only after #6566 is resolved)

[shubhi2000]

Hi @rishi-raj-jain
I would like to work on this. Could you assign it to me? Thanks!

[rishi-raj-jain]

Done! Please make sure to have two sections i.e. the view of doing it as the merchant & the view of doing it as the customer.

One thing to note at the end of the merchants section is that they can disable customer level upgrades/downgrades via our portal by toggling the setting as noted in #6668.

[shubhi2000]

Okay sure, thank you
Should there be two separate guides for upgrades and downgrades? Or it has to be in one guide only?

[rishi-raj-jain]

Let's do two guides and I've assigned #6570 to you.

[shubhi2000]

Thanks

[rishi-raj-jain]

/tip $75 @shubhi2000