Stripe

stripe integration using cloud functions introduction in this guide, we are going to show you how to integrate a hosted backend in back4app with stripe api the best architecture choice to build it on back4app is using a very powerful feature called cloud functions once you finish the cloud function integration with stripe you will be able to use this integration for all your front end projects (web, ios, android) this guide presents a complete stripe integration using a web example prerequisites to complete this tutorial, you will need an app created at back4app follow the create new app tutorial to learn how to create an app at back4app account created in stripe goal integrate stripe on a web project using back4app cloud functions what is stripe? stripe is a tech company operating in over 25 countries, which allows both individuals and businesses to accept payments over the internet stripe focuses on providing the technical, fraud prevention, and banking infrastructure required to operate online payment systems this tutorial will walk you through the steps of creating functions and integrating stripe api to your parse server into your web app more specifically, in this guide, we will create an environment in which a user can log in or sign up, register credit cards, and generate example purchases with them via stripe payments also, you will be guided on how to set up the whole process as well as test if the connection to the server and the stripe api is working properly 1 create a stripe account go to stripe and click on the sign up to create an account there, you just need to provide your personal information and to which country your account belongs next, verify your stripe account (you will receive an email containing a verification link from stripe) click on that link, and then follow the steps to confirm your stripe email address 2 setting up your database classes after configuring the stripe environment for step 1, go to your back4app app dashboard so you can set up your database this step is not obligatory since parse will automatically create the classes while the cloud functions try to create a new object, but we will go through them to explain which fields will be created and why there will be two classes that will hold your app stripe related data paymentmethod paymentmethod and payment payment here is how the classes are laid out paymentmethod paymentmethod type type (string) its value will always be “card”; card card (object) will hold the complete stripe data regarding the registered card; stripeid stripeid (string) id referencing this paymentmethod on the stripe backend; user user (pointer to parse user) direct reference to which use this paymentmethod belongs payment payment data data (object) will hold the complete stripe data regarding the payment; user user (pointer to parse user) direct reference to which user this payment belongs we will also add two new string string value columns in your app default user user class called setupsecret setupsecret and customerid customerid that will contain the stripe ids that relate the user user to its stripe counterpart 3 implementing cloud code let’s configure the cloud code functions https //docs parseplatform org/cloudcode/guide/#cloud functions in the app, installing the stripe module and deploying the code if you want to better understand the cloud code enviroment, check this guide 3 1 get your stripe key now, open your stripe dashboard, navigate to the developers developers page at the top and then select api keys api keys on the left menu in that section, you will be able to see your publishable key publishable key and your secret key secret key write down these keys as you will need them later 3 2 cloud code files on your computer, create the following files, that will be responsible to install the module and adding your cloud code functions to back4app 1 { 2 "dependencies" { 3 "stripe" " " 4 } 5 } add the code below to a new file and don’t forget to paste your stripe secret key on the top main js 1 const stripe secret key = 2 "your stripe secret key"; 3 const stripe = require("stripe")(stripe secret key); 4 5 // stripe needs an unique customer id to create payments, so after 6 // signing up, this function should be called to do this operation 7 parse cloud define("createstripecustomer", async (request) => { 8 // get parse user object 9 const userquery = new parse query(parse user); 10 userquery equalto("objectid", request params userid); 11 let user = await userquery first(); 12 13 const customer = await stripe customers create({ email user get("email") }); 14 // creates an stripe setupintent, that will enable the stripe lib to perform 15 // a singel operation related to payments 16 const intent = await stripe setupintents create({ 17 customer customer id, 18 }); 19 // set and save the stripe ids to the parse user object 20 user set({ 21 customerid customer id, 22 setupsecret intent client secret, 23 }); 24 return await user save(null, { usemasterkey true }); 25 }); 26 27 // creates new payment method for a registered customer 28 parse cloud define("addnewpaymentmethod", async (request) => { 29 // get parse user object 30 const userquery = new parse query(parse user); 31 userquery equalto("objectid", request params userid); 32 let user = await userquery first(); 33 34 // retrieve complete stripe payment method by its id 35 const stripepaymentmethod = await stripe paymentmethods retrieve( 36 request params paymentmethodid 37 ); 38 39 // create a new setupintent so the customer can add a new method next time 40 const intent = await stripe setupintents create({ 41 customer `${stripepaymentmethod customer}`, 42 }); 43 user set("setupsecret", intent client secret); 44 user = await user save(null, { usemasterkey true }); 45 46 // creates a new parse object in the paymentmethod class 47 let paymentmethod = new parse object("paymentmethod"); 48 paymentmethod set({ 49 user user, 50 type "card", 51 stripeid stripepaymentmethod id, 52 card stripepaymentmethod card, 53 }); 54 paymentmethod save(); 55 return true; 56 }); 57 58 // creates a new payment using a valid payment method 59 parse cloud define("createnewpayment", async (request) => { 60 // get parse user object 61 const userquery = new parse query(parse user); 62 userquery equalto("objectid", request params userid); 63 let user = await userquery first(); 64 65 const { amount, currency, payment method } = request params paymentdata; 66 67 // look up the stripe customer id 68 const customer = user get("customerid"); 69 70 // create a charge using an unique idempotency key 71 // to protect against double charges 72 const idempotencykey = new date() gettime(); 73 const payment = await stripe paymentintents create( 74 { 75 amount, 76 currency, 77 customer, 78 payment method, 79 off session false, 80 confirm true, 81 confirmation method "manual", 82 }, 83 { idempotencykey } 84 ); 85 // if the result is successful, write it back to the database 86 let payment = new parse object("payment"); 87 payment set({ 88 user user, 89 data payment, 90 }); 91 await payment save(); 92 93 return true; 94 }); 4 upload functions to cloud code go to the back4app website, log in and then find your app after that, click on dashboard dashboard link and you will end up on the page shown below to deploy your cloud code, click on the + add + add button and find the main js main js and package json package json files that you created in the previous step, then click on the deploy deploy button you have just configured cloud code functions that you can use on any platform! check the deploy & call functions guide to learn how to call them on the next step, you will work with a javascript project that calls them 5 integrating a javascript app with cloud code now you will see an example of a straightforward html page with javascript that has three main features signing in or up a user on parse, creating valid payment methods (credit cards), and creating new payments, charging these methods belonging to the user go ahead and create a new directory in your computer and a new html file with the following code inside it index html 1 2 3 4 5 6 7 back4app stripe payments 8 9 10 11 12 13 15 react on back4app 16 back4app stripe payments 17 18 19 20 21 22 sign in 23 24 25 26 sign in 27 28 don't have an account yet? sign up instead 29 30 31 sign up 32 33 34 35 sign up 36 37 already have an account? sign in instead 38 39 40 41 42 43 44 45 add new payment method 46 47 use any of the 48 stripe test cards 49 for this demo! 50 51 52 53 54 55 56 save card 57 58 59 60 create new payment 61 62 63 card (payment method) 64 65 66 68 69 currency 70 usd 71 brl 72 eur 73 74 75 charge selected card 76 77 78 79 payments 80 81 82 83 sign out 84 85 86 87 88 89 90 91 92 in this file you will find two main sections, the first one being the authentication one, which will be rendered by default if the user is not logged in yet after logging in, the payment section will be shown, containing all the forms responsible for creating data on stripe and also communicating with the cloud code functions on back4app we now need to create a javascript function containing the code that ties it all together, called index js index js index js 1 // define and initialize parse and stripe libs 2 const parse app id = "your parse id"; 3 const parse js key = "your parse js key"; 4 parse initialize(parse app id, parse js key); 5 parse serverurl = "https //parseapi back4app com/"; 6 7 const stripe publishable key = "your stripe publishable key"; 8 const stripe = stripe(stripe publishable key); 9 10 // holds the currentuser complete parse object 11 let currentuser = null; 12 const setcompletecurrentuser = async () => { 13 // called when user is already signed in, completing 14 // the currentuser object with the full one 15 currentuser = await new parse query(parse user) 16 equalto("objectid", parse user current() id) 17 first(); 18 // retrieve and render user cards and payments 19 retrievecurrentuserpaymentmethods(); 20 retrievecurrentuserpayments(); 21 }; 22 23 const retrievecurrentuserpaymentmethods = async () => { 24 // query and render user paymentmethods 25 const pmquery = new parse query("paymentmethod"); 26 pmquery equalto("user", parse user current()); 27 paymentmethods = await pmquery find(); 28 renderpaymentmethodoptions(paymentmethods); 29 }; 30 31 const retrievecurrentuserpayments = async () => { 32 // query and render user payments 33 const paymentsquery = new parse query("payment"); 34 paymentsquery equalto("user", parse user current()); 35 payments = await paymentsquery find(); 36 renderpayments(payments); 37 }; 38 39 const renderpaymentmethodoptions = async (paymentmethods) => { 40 for (let paymentmethod of paymentmethods) { 41 const optionid = `card ${paymentmethod get("stripeid")}`; 42 let optionelement = document getelementbyid(optionid); 43 44 // add a new option if one doesn't exist yet 45 if (!optionelement) { 46 optionelement = document createelement("option"); 47 optionelement id = optionid; 48 document 49 queryselector("select\[name=payment method]") 50 appendchild(optionelement); 51 } 52 53 optionelement value = paymentmethod get("stripeid"); 54 optionelement text = `${paymentmethod get("card") brand} •••• ${ 55 paymentmethod get("card") last4 56 } | expires ${paymentmethod get("card") exp month}/${ 57 paymentmethod get("card") exp year 58 }`; 59 } 60 }; 61 62 const renderpayments = (payments) => { 63 for (let payment of payments) { 64 let lielement = document getelementbyid(`payment ${payment id}`); 65 if (!lielement) { 66 lielement = document createelement("li"); 67 lielement id = `payment ${payment id}`; 68 } 69 70 const paymentdata = payment get("data"); 71 let content = ""; 72 if ( 73 paymentdata status === "new" || 74 paymentdata status === "requires confirmation" 75 ) { 76 content = `creating payment for ${formatamount( 77 paymentdata amount, 78 paymentdata currency 79 )}`; 80 } else if (paymentdata status === "succeeded") { 81 const card = paymentdata charges data\[0] payment method details card; 82 content = `payment for ${formatamount( 83 paymentdata amount, 84 paymentdata currency 85 )} on ${card brand} card •••• ${card last4} ${paymentdata status}!`; 86 } else { 87 content = `payment for ${formatamount( 88 paymentdata amount, 89 paymentdata currency 90 )} ${paymentdata status}`; 91 } 92 lielement innertext = content; 93 document queryselector("#payments list") appendchild(lielement); 94 } 95 }; 96 97 // checks if user is already signed in on parse 98 if (parse user current() !== null) { 99 setcompletecurrentuser(); 100 // hide auth screen and show payment fields 101 document getelementbyid("auth") style display = "none"; 102 document getelementbyid("content") style display = "block"; 103 } 104 105 // toggle signin and signup forms 106 document 107 queryselector("#signup toggle") 108 addeventlistener("click", async ( event) => { 109 document getelementbyid("auth signin form") style display = "none"; 110 document getelementbyid("auth signup form") style display = "block"; 111 clearauthformfields(); 112 }); 113 document 114 queryselector("#signin toggle") 115 addeventlistener("click", async ( event) => { 116 document getelementbyid("auth signup form") style display = "none"; 117 document getelementbyid("auth signin form") style display = "block"; 118 clearauthformfields(); 119 }); 120 121 // clear auth form fields 122 const clearauthformfields = () => { 123 document 124 queryselector("#auth") 125 queryselectorall("input") 126 foreach((input) => (input value = "")); 127 }; 128 129 // handle auth forms 130 document 131 queryselector("#auth signin form") 132 addeventlistener("submit", async (event) => { 133 event preventdefault(); 134 toggleallbuttonsenabled(false); 135 const form = new formdata(event target); 136 const email = form get("email"); 137 const password = form get("password"); 138 139 // try to signin on parse 140 try { 141 let user = await parse user login(email, password); 142 if (user !== null) { 143 currentuser = user; 144 // hide auth screen and show payment fields 145 document getelementbyid("auth") style display = "none"; 146 document getelementbyid("content") style display = "block"; 147 clearauthformfields(); 148 } 149 } catch (error) { 150 alert(error); 151 } 152 toggleallbuttonsenabled(true); 153 }); 154 155 document 156 queryselector("#auth signup form") 157 addeventlistener("submit", async (event) => { 158 event preventdefault(); 159 toggleallbuttonsenabled(false); 160 const form = new formdata(event target); 161 const email = form get("email"); 162 const password = form get("password"); 163 164 // try to signup on parse 165 try { 166 let user = await parse user signup(email, password, { email email }); 167 // cloud code to create stripe user and intent 168 user = await parse cloud run("createstripecustomer", { userid user id }); 169 if (user !== null) { 170 currentuser = user; 171 // hide auth screen and show payment fields 172 document getelementbyid("auth") style display = "none"; 173 document getelementbyid("content") style display = "block"; 174 clearauthformfields(); 175 } 176 } catch (error) { 177 alert(error); 178 } 179 toggleallbuttonsenabled(true); 180 }); 181 182 // signout from parse 183 document queryselector("#signout") addeventlistener("click", async ( event) => { 184 await parse user logout(); 185 currentuser = null; 186 // show auth screen and hide payment fields 187 document getelementbyid("auth") style display = "block"; 188 document getelementbyid("content") style display = "none"; 189 }); 190 191 // creates stripe card ui element 192 const elements = stripe elements(); 193 const cardelement = elements create("card"); 194 cardelement mount("#card element"); 195 196 // handle add new card form 197 document 198 queryselector("#payment method form") 199 addeventlistener("submit", async (event) => { 200 event preventdefault(); 201 toggleallbuttonsenabled(false); 202 if (!event target reportvalidity()) { 203 return; 204 } 205 const form = new formdata(event target); 206 const cardholdername = form get("name"); 207 208 const result = await stripe confirmcardsetup( 209 currentuser get("setupsecret"), 210 { 211 payment method { 212 card cardelement, 213 billing details { 214 name cardholdername, 215 }, 216 }, 217 } 218 ); 219 220 if (result error) { 221 alert(result error message); 222 toggleallbuttonsenabled(true); 223 return null; 224 } 225 226 let setupintent = result setupintent; 227 228 // cloud code to add new payment method 229 let cloudcoderesult = await parse cloud run("addnewpaymentmethod", { 230 userid currentuser id, 231 paymentmethodid setupintent payment method, 232 }); 233 234 toggleallbuttonsenabled(true); 235 alert("success on creating a new payment method!"); 236 237 // update payment method options 238 retrievecurrentuserpaymentmethods(); 239 }); 240 241 // handles new payment form 242 document 243 queryselector("#payment form") 244 addeventlistener("submit", async (event) => { 245 event preventdefault(); 246 toggleallbuttonsenabled(false); 247 const form = new formdata(event target); 248 const amount = number(form get("amount")); 249 const currency = form get("currency"); 250 // gets selected card option id 251 const paymentmethod = form get("payment method"); 252 const paymentdata = { 253 payment method paymentmethod, 254 currency, 255 amount formatamountforstripe(amount, currency), 256 status "new", 257 }; 258 // cloud code to create new payment 259 let cloudcoderesult = await parse cloud run("createnewpayment", { 260 userid currentuser id, 261 paymentdata paymentdata, 262 }); 263 264 toggleallbuttonsenabled(true); 265 alert("success on creating a new payment!"); 266 267 retrievecurrentuserpayments(); 268 }); 269 270 // helper functions 271 const toggleallbuttonsenabled = (enabledvalue) => { 272 document 273 queryselectorall("button") 274 foreach((button) => (button disabled = !enabledvalue)); 275 }; 276 277 const formatamount = (amount, currency) => { 278 amount = zerodecimalcurrency(amount, currency) 279 ? amount 280 (amount / 100) tofixed(2); 281 return new intl numberformat("en us", { 282 style "currency", 283 currency, 284 }) format(amount); 285 }; 286 287 // format amount for stripe 288 const formatamountforstripe = (amount, currency) => { 289 return zerodecimalcurrency(amount, currency) 290 ? amount 291 math round(amount 100); 292 }; 293 294 // check if we have a zero decimal currency 295 // https //stripe com/docs/currencies#zero decimal 296 const zerodecimalcurrency = (amount, currency) => { 297 let numberformat = new intl numberformat(\["en us"], { 298 style "currency", 299 currency currency, 300 currencydisplay "symbol", 301 }); 302 const parts = numberformat formattoparts(amount); 303 let zerodecimalcurrency = true; 304 for (let part of parts) { 305 if (part type === "decimal") { 306 zerodecimalcurrency = false; 307 } 308 } 309 return zerodecimalcurrency; 310 }; make sure to add your stripe publishable key and also your parse app id and js key to the top of the file these are some of the key elements to check out and understand in this script check the usage of the parse user current parse user current method when loading the script for the first time to render the correct part of the page; the form submit action listeners that will perform actions on parse, like signing in or up and calling the cloud code functions to create the stripe related objects and save on your back4app database; the “retrieve” and “return” methods that make queries on parse to retrieve the current user’s payment payment and paymentmethod paymentmethod objects before testing the app, add the following stylesheet in a css file called app css app css inside the same directory 1 / back4app guide / 2 3 , 4 before, 5 after { 6 margin 0; 7 padding 0; 8 box sizing inherit; 9 } 10 11 html { 12 font family sans serif; 13 box sizing border box; 14 outline none; 15 overflow auto; 16 } 17 18 body { 19 margin 0; 20 background color #fff; 21 } 22 23 h1, 24 h2, 25 h3, 26 h4, 27 h5, 28 h6 { 29 margin 0; 30 } 31 32 p { 33 margin 0; 34 } 35 36 container { 37 width 100%; 38 max width 600px; 39 margin auto; 40 padding 20px 0; 41 } 42 43 wrapper { 44 width '90%'; 45 align self 'center'; 46 } 47 48 header { 49 display flex; 50 flex direction column; 51 align items center; 52 padding 25px 0; 53 background color #208aec; 54 } 55 56 header logo { 57 height 55px; 58 margin bottom 20px; 59 object fit contain; 60 } 61 62 header text bold { 63 margin bottom 3px; 64 color rgba(255, 255, 255, 0 9); 65 font size 16px; 66 font weight bold; 67 } 68 69 header text { 70 color rgba(255, 255, 255, 0 9); 71 font size 15px; 72 } 73 74 flex row { 75 display flex; 76 } 77 78 flex between { 79 display flex; 80 align items center; 81 justify content space between; 82 } 83 84 form wrapper { 85 margin top 20px; 86 margin bottom 10px; 87 } 88 89 form heading { 90 margin bottom 10px; 91 } 92 93 form { 94 padding bottom 25px; 95 margin 25px 0; 96 border bottom 1px solid rgba(0, 0, 0, 0 12); 97 } 98 99 form input { 100 display block; 101 width 100%; 102 height 46px; 103 padding 0 15px; 104 background color #e6e6e6; 105 border 1px solid #ccc; 106 border radius 999px; 107 margin bottom 20px; 108 font size 16px; 109 } 110 111 form button { 112 display block; 113 width 100%; 114 height 42px; 115 padding 0 15px; 116 background color #208aec; 117 border 1px solid #208aec; 118 border radius 999px; 119 color #fff; 120 font size 16px; 121 cursor pointer; 122 } 123 124 form hint { 125 display block; 126 margin top 20px; 127 color rgba(0, 0, 0, 0 5); 128 font size 16px; 129 text align center; 130 text decoration color rgba(0, 0, 0, 0 4); 131 } 132 133 card element wrapper { 134 padding 13px 15px; 135 margin bottom 20px; 136 background color #e6e6e6; 137 border 1px solid #ccc; 138 border radius 999px; 139 } test the app using any kind of local http server, like the http server node package after signing up, your app should look like this conclusion with the guide described above, you got to use stripe with a cloud code function in back4app as well as integrate payments to a simple javascript app! in case you face any trouble while integrating stripe or a function doesn’t work, please contact our team via chat!