Create Stripe invoice

Notes

This Stripe function allows you to create an invoice via the Stripe API. 

Like the `Stripe Checkout Session` function, this is ideally used after a user has submitted a form indicating what they want to purchase. 

Code

        
Language:  JavaScript


        
 
// Front-end code
function createStripeInvoice() {
    
    let pricePerUnit = 100;
    let quantOfUnit - 1;
    let unitName = "Name of line item";
    let customerEmail = "bob@bobness.co.uk";
    
    const apiUrl = 'FULL URL OF YOUR SERVERLESS FUNCTION GOES HERE';
    const queryParams = {
      pricePerUnit,
      quantOfUnit,
      unitName,
      customerEmail
    };
 
    return $.ajax({
      url: apiUrl,
      method: 'GET',
      data: queryParams,
      dataType: 'json'
    });
  }
 
// Back end code
 
const stripeAccessToken = `Bearer 1234`;
 
const axios = require('axios');
const querystring = require('querystring');
 
// Define headers for API requests
const headers = {
    'Authorization': stripeAccessToken,
    'Stripe-Version': '2020-08-27',
    'Content-Type': 'application/x-www-form-urlencoded'
};
 
// Function to create an invoice
async function createInvoice(customerId, pricePerUnit, quantOfUnit, unitName) {
  try {
    console.log("Sending invoice line item");
    const invoiceLineItemResponse = await axios.post('https://api.stripe.com/v1/invoiceitems', querystring.stringify({
      customer: customerId,
      amount: (pricePerUnit * quantOfUnit) * 100, // Calculate the total amount based on quantity of units
      currency: 'gbp',
      description: unitName
    }), { headers });
    console.log("Invoice line item created successfully");
 
    // Retrieve the invoice line item ID from the response
    const invoiceLineItemId = invoiceLineItemResponse.data.id;
    console.log("Sending invoice");
    const invoiceResponse = await axios.post('https://api.stripe.com/v1/invoices', querystring.stringify({
      customer: customerId,
      collection_method: 'send_invoice',
      auto_advance: true,
      days_until_due: 30
    }), { headers });
 
    console.log("Invoice created successfully");
 
    return invoiceResponse.data;
  } catch (error) {
    throw new Error(error.message);
  }
}
exports.main = async (context, sendResponse) => {
    try {
        let pricePerUnit = parseInt(context.params.pricePerUnit[0]);
        let quantOfUnit = parseInt(context.params.quantOfUnit[0]);
        let unitName = context.params.unitName[0];
        let customerEmail = context.params.customerEmail[0];
 
        let customerId;
        console.log("pricePerUnit:", pricePerUnit);
        console.log("quantOfUnit:", quantOfUnit);
        console.log("unitName:", unitName);
        console.log("customerEmail:", customerEmail);
        // Check if the customer already exists
        let customersResponse = await axios.get(`https://api.stripe.com/v1/customers?email=${customerEmail}`, { headers });
        if (customersResponse.data.data.length > 0) {
            // Use existing customer
            customerId = customersResponse.data.data[0].id;
            console.log("Existing customer found in Stripe");
            console.log("customerId:", customerId);
        } else {
            // Create new customer
            let customerResponse = await axios.post('https://api.stripe.com/v1/customers', querystring.stringify({ email: customerEmail }), { headers });
            customerId = customerResponse.data.id;
            console.log("Created new customer in Stripe");
            console.log("customerId:", customerId);
        }
 
        // Create invoice using the createInvoice function
        const invoiceData = await createInvoice(customerId, pricePerUnit, quantOfUnit, unitName);
 
        sendResponse({ body: invoiceData, statusCode: 200 });
    } catch (error) {
        sendResponse({ body: error.message, statusCode: 400 });
    }
};
 
      

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