Merge tag for subscription ID

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From customer:

For subscriptions, a merge tag {pronamic_subscription_payment_id} is available for notifications that corresponds to the ID of the payment (PAYMENTS in back-end).

The corresponding subscription does not necessarily have the same ID. Does there also exist a merge tag for this (eg {pronamic_subscription_id})? I can't find them in the list of available merge tags.

Apparently, there is no {pronamic_subscription_id} merge tag yet for use in notifications.

Internal Help Scout ticket: https://secure.helpscout.net/conversation/2252404810/25683/

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Added in 9d25939.