A Flexible membership can now carry recurring add-ons: extra services a client
pays for each billing period on top of their class allowance, such as a mat and
towel service, storage, or access to your online classes.

Each add-on has its own price, may be limited to certain allowances (for
example only with 8 classes or more, or only with Unlimited), and carries a short
staff label. When a client buys a membership with add-ons, the add-ons are
billed as their own lines on the same recurring payment, appear on the receipt
under the membership line, and show as a small pill next to the pass on the
check-in roster, the client card and the client's own pass list, so staff can
see at a glance who has the towel service without opening anything.

If a client later changes their class allowance to one that does not include an
add-on, the add-on stops at the same renewal, and the change asks for
confirmation before it is scheduled. When a membership ends, its add-ons end
with it.

Setting up add-ons in the Flexible pass builder, and choosing them in the
online checkout, arrive in the next release. Nothing changes for existing
memberships or for fixed plans.