Direct Link To Resubscribe

I am preparing some emails in a renewal campaign and I would like to add a link to take members straight to resubscribe.

I could send them to their subscription plan, but, taking the link from the resubscribe button I have substituted the user ID with [userid], creating this:
my-community-profile/pluginclass?user=[user_id]&plugin=cbpaidsubscriptions

Is this correct and, if yes, are there any potential issues I might face?

CBSubs provides 2 plan URLs now. 1 is to the plans page and 1 is straight to the basket. They are as follows.

Display:
index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&do=displayplans&plans=PLAN_ID

Basket:
index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&do=addplanstobasket&plans=PLAN_ID

Sounds like you'll want to use the basket URL. Ensure you've latest CBSubs release. You can also find these URLs at the top while editing a plan in CbSubs > Plans. You don't need user_id for either of the above URLs.

For the basket version, is PLAN_ID automatically replaces by the members current subscription plan?#

I get an error:
500 Incorrect second argument for CBTxt::T array instead of string.

Replacing with a plan number works.

In the 'CB Paid Subscriptions: Mailers', can I use a substitution? Something like
index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&do=addplanstobasket&plans=[PLAN_ID_substitution]

I want to make the renewal process as simple and quick as possible!

You will have to supply the plan id. Either via substitution or just hardcoding it. If you've latest CBSubs build installed and you've enabled content prepare usage for a Custom HTML or module for example you can also use the below usage.

[cbsubs:plans plan="PLAN_ID" output="basket" /]

Additionally you can make sure the plan is active or expired so it will only show the URL in either of those cases using the below.

[cbsubs:if plan="PLAN_ID" status!="I" and plan="PLAN_ID" status!="U"]
[cbsubs:plans plan="PLAN_ID" output="basket" /]
[/cbsubs:if]

Those 2 status checks should ensure the plan isn't invalid or hasn't been upgraded. No subscription at all is treated as invalid status.

How do I 'enable content prepare usage'?

So, to clarify, as I want this in a timed & templated automated email, the link should read:

index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&do=addplanstobasket&plans=[cbsubs:plans plan="PLAN_ID" output="basket" /]

This gives the same CBTxt error.

Removing do=addplanstobasket& and using:

index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&plans=[cbsubs:plans plan="PLAN_ID" output="basket" /]

Returns 'You are not authorized to view this page'

How do I 'enable content prepare usage'?

Depends on where you're putting this. If it's in a Custom or CB Content Module it's a part of the modules parameters. If a Custom HTML field then again a part of its parameters.

index.php?option=com_comprofiler&task=pluginclass&plugin=cbpaidsubscriptions&do=addplanstobasket&plans=[cbsubs:plans plan="PLAN_ID" output="basket" /]

That's not correct. You only need the below. It will output the URL for you.

[cbsubs:plans plan="PLAN_ID" output="basket" /]

You will still need to supply a plan id.