Recurring Subscriptionspatron

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+NIP-88
+======
+
+Recurring Subscriptions
+-----------------------
+
+`draft` `optional` `author:pablof7z`
+
+This NIP defines a way for a pubkey to create recurring subscription payments to another pubkey.
+
+## Tier Event
+A pubkey can create "tiers". These tiers might provide certain benefits to the supporters who subscribe to these.
+
+```json
+{
+    "kind": 7002,
+    "content": "<description of the tier>",
+    "tags": [
+        [ "title", "..." ],
+        [ "amount", "<amount-in-base-unit>", "currency", "<cadence>" ]
+    ]
+}
+```
+
+This event is generated by a pubkey who wants to allow users to support with different tiers.
+
+`.content` SHOULD be a description of what users who subscribe can expect.
+Tag `title` is an optional title for the tier.
+Tag `amount` MUST specify the payment required for this tier and its cadence.
+    * The first argument should be the stringified amount and the second argument the currency
+    * The third argument SHOULD be one of `daily`, `monthly`, `yearly`
+One or more `amount` tags MUST exist.
+
+#### Examples
+* `[ "amount", "100", "usd", "daily" ]`, $1.00 a day.
+* `[ "amount", "1000000", "btc", "daily" ]`, 1000000 millisats a day.
+
+## Subscribe Event
+
+```json
+{
+    "kind": 7001,
+    "content": "<optional-message>",
+    "tags": [
+        [ "p", "<recipient-pubkey>" ],
+        [ "e", "<supporting-tier-id>" ],
+        [ "amount", "<amount-in-base-unit>", "currency", "<cadence>" ]
+    ]
+}
+```
+
+When a user wants to subscribe to subscribe to support a user they create a `kind:7001` event.
+
+* `.content` is an optional message the supporter can write.
+* The `p` tag MUST tag the pubkey being supported.
+* The `e` tag is optional, and should point to a `kind:7001` support tier event. There MUST be exactly 0 or 1 `e` tags.
+* The `amount` tag specifies what the supporters is committing to pay to the supported pubkey and the candence.
+
+The `kind:7001` event can be created without an `e` tag so that users can create recurring support events without the pubkey receiving the support having explicitly created a support tier.
+
+## Paying
+The supporting user should create a zap p-tagging the receiver and e-tagging the `kind:7001`. There MUST be a single `p` and a single `e` tag in the zap request.
+
+```json
+{
+    "kind": 9734,
+    "content": "",
+    "tags": [
+        [ "p", "<recipient-pubkey>" ],
+        [ "e", "<kind-7001-event-id>" ]
+    ]
+```
+
+Clients supporting this NIP can check for zaps e-tagging the `kind:7001` event to find the pubkeys that have a valid, paid subscriptions at each different period.
+
+The same `kind:7001` is re-zapped on a regular basis per the cadence specified in the event.
+
+## Stopping a subscription
+A user who wants to stop a subscription by publishing a `kind:5` deletion request of the `kind:7001` event.