Subscriber is to subscription as provider is to ...?

Solution 1:

Provision is correct. A provision is something provided (see definition 1 here).

Solution 2:

Provision is a word with multiple meanings; it can refer to a legal stipulation, an advance measure, food (typically in the plural), and that which is provided.

Thus, the word provision is actually accurate in this context.

That said, it's true that the word's other meanings have the potential to confuse careless readers. In that case, an unambiguous word like product might be preferable.

Solution 3:

In the context of subscriber/subscription, for example a newspaper subscriber, then the provider provides the subscription to the subscriber.

So the provider might say:

As the provider, we will provide your subscription for a monthly fee.