add stripe subcription template

src/functions-templates/js/stripe-subscription/.netlify-function-template.js

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+const chalk = require("chalk");
+
+module.exports = {
+  name: "stripe-charge",
+  description: "Stripe Charge: Charge a user with Stripe",
+  async onComplete() {
+    console.log(
+      `${chalk.yellow("stripe-charge")} function created from template!`
+    );
+    if (!process.env.STRIPE_SECRET_KEY) {
+      console.log(
+        `note this function requires ${chalk.yellow(
+          "STRIPE_SECRET_KEY"
+        )} build environment variable set in your Netlify Site.`
+      );
+      let siteData = { name: "YOURSITENAMEHERE" };
+      try {
+        siteData = await this.netlify.api.getSite({
+          siteId: this.netlify.site.id
+        });
+      } catch (e) {
+        // silent error, not important
+      }
+      console.log(
+        `Set it at: https://app.netlify.com/sites/${
+          siteData.name
+        }/settings/deploys#environment-variables (must have CD setup)`
+      );
+    }
+  }
+};

src/functions-templates/js/stripe-subscription/package.json

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+{
+  "name": "stripe-subscription",
+  "version": "1.0.0",
+  "description": "netlify functions:create - Create a subscription with Stripe",
+  "main": "stripe-subscription.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "netlify",
+    "serverless",
+    "apis",
+    "stripe",
+    "js"
+  ],
+  "author": "Netlify",
+  "license": "MIT",
+  "dependencies": {
+    "stripe": "^6.28.0"
+  }
+}

src/functions-templates/js/stripe-subscription/stripe-subscription.js

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+// with thanks https://github.com/LukeMwila/stripe-subscriptions-backend/blob/master/stripe-api/index.ts
+
+const stripe = require("stripe")(process.env.STRIPE_SECRET_KEY);
+
+const respond = (fulfillmentText: any): any => {
+  return {
+    statusCode: 200,
+    body: JSON.stringify(fulfillmentText),
+    headers: {
+      "Access-Control-Allow-Credentials": true,
+      "Access-Control-Allow-Origin": "*",
+      "Content-Type": "application/json"
+    }
+  };
+};
+
+exports.handler = async function(event, context) {
+  try {
+    const incoming = JSON.parse(event.body);
+    const { stripeToken, email, productPlan } = incoming;
+  } catch (err) {
+    console.error(`error with parsing function parameters: `, err);
+    return {
+      statusCode: 400,
+      body: JSON.stringify(err)
+    };
+  }
+  try {
+    const data = await createCustomerAndSubscribeToPlan(
+      stripeToken,
+      email,
+      productPlan
+    );
+    return respond(data);
+  } catch (err) {
+    return respond(err);
+  }
+};
+
+async function createCustomerAndSubscribeToPlan(
+  stripeToken: string,
+  email: string,
+  productPlan: string
+) {
+  // create a customer
+  const customer = await stripe.customers.create({
+    email: email,
+    source: stripeToken
+  });
+  // retrieve created customer id to add customer to subscription plan
+  const customerId = customer.id;
+  // create a subscription for the newly created customer
+  const subscription = await stripe.subscriptions.create({
+    customer: customerId,
+    items: [{ plan: productPlan }]
+  });
+  return subscription;
+}