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.

{
    "kind": 37001,
    "content": "<description of the tier>",
    "tags": [
        [ "title", "..." ],
        [ "image", "..." ],
        [ "amount", "<amount-in-base-unit>", "currency", "<monthly>" ],
        [ "amount", "<amount-in-base-unit>", "currency", "<quarterly>" ]
    ]
}

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 image is an optional image 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", "msats", "daily" ], 1000000 millisats a day.

{
    "kind": 7001,
    "content": "<optional-message>",
    "tags": [
        [ "p", "<recipient-pubkey>" ],
        [ "a", "<supporting-tier-event-id>" ],
        [ "event", "<stringied-event-subscribed-to>" ],
        [ "amount", "<amount-in-base-unit>", "currency", "<cadence>" ]
    ]
}

When a user wants 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 a tag is optional; it should point to a kind:37001 support tier event. There MUST be exactly 0 or 1 a tag.
The event tag is optional; subscribers can opt to keep the version of the event they subscribed to. There MUST be exactly 0 or 1 event tag.
The amount tag specifies what the supporters is committing to pay to the supported pubkey and the candence. MUST be equal to one of the amounts specified in the kind:37001 event. There MUST be exactly 1 amount tag.

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.

{
    "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.

Verifying Payment

The following conditions must be met to verify a payment:

Time between zap receipts should be equal or less than the cadence specified in the kind:7001 event.
Amount of the zap receipt should be equal or greater than the amount specified in the kind:7001 event. For currencies not directly supported by the zap spec, clients should do a best effort conversion to the currency specified in the kind:7001 event at the time of zap receipt.
Zap-receipts should include a zap request e-tagging the kind:7001 event. Zap-receipts might not include a signature (for NWC-automated payments where the subscriber is not present to sign the zap request).
Validations specified in NIP-57.

Stopping a subscription

A user who wants to signal they are no longer subscribed can publish a kind:7002 event tagging the kind:7001 they are stopping and p-tagging the pubkey they are no longer subscribed to.

{
    "kind": 7002,
    "content": "<optional-message>",
    "tags": [
        [ "p", "<recipient-pubkey>" ],
        [ "e", "<kind-7001-event-id>" ],
    ]
}

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