feat: add method to get subscription info (#7)

packages/sails-lemonsqueezy/adapter.js

@@ -2,5 +2,8 @@ const methods = require('./machines')
 module.exports = {
   identity: 'sails-lemonsqueezy',
   config: {},
-  checkout: methods.checkout
+  checkout: methods.checkout,
+  subscription: {
+    get: methods.subscription.get
+  }
 }

packages/sails-lemonsqueezy/machines/index.js

@@ -1,3 +1,6 @@
 module.exports = {
-  checkout: require('./checkout')
+  checkout: require('./checkout'),
+  subscription: {
+    get: require('./subscription/get')
+  }
 }

packages/sails-lemonsqueezy/machines/subscription/get.js

@@ -0,0 +1,41 @@
+const fetch = require('../../helpers/fetch')
+
+module.exports = require('machine').build({
+  friendly: 'Get Subscription',
+  description: 'Get a subscription by ID.',
+  moreInfoUrl: 'https://docs.lemonsqueezy.com/api/subscriptions',
+  inputs: {
+    apiKey: require('../../helpers/parameters').LEMON_SQUEEZY_API_KEY,
+    id: {
+      type: 'string',
+      description: 'The ID of the subscription to get.',
+      allowNull: true
+    }
+  },
+  exits: {
+    success: {
+      outputFriendlyName: 'Subscription',
+      outputDescription: 'The subscription that was retrieved.'
+    },
+    error: {
+      outputFriendlyName: 'Error',
+      outputDescription: 'An unexpected error occurred.'
+    }
+  },
+  fn: async function ({ apiKey, id }, exits) {
+    const adapterConfig = require('../../adapter').config
+
+    const subscription = await fetch(`/subscriptions/${id}`, {
+      method: 'GET',
+      headers: {
+        authorization: `Bearer ${apiKey || adapterConfig.apiKey}`
+      }
+    })
+    if (subscription.errors) {
+      const errors = subscription.errors
+      return exits.error(errors)
+    }
+
+    return exits.success(subscription)
+  }
+})