Azure Function main entry point showing how to do payments using Braintree's v.zero API.

bt-run.csx

using System;
using Braintree;

public static void Run(string input, TraceWriter log)
{
    var braintreeEnvironment = "sandbox"; // alternative = production

    // These three config items should be stored in Azure KeyVault
    var merchantId = "5xxxxxxxxxxxxxx7";
    var merchPubKey = "tyyyyyyyyyyyyyyh";
    var merchPrivateKey = "4oooooooooooooooooooooooooooooo4";

    // This is a payment nonce or customer ID as supplied by 
    // the Braintree.
    var paymentMethodToken = "9aaaaa";

    var gateway = new BraintreeGateway(braintreeEnvironment,
                                        merchantId,
                                        merchPubKey,
                                        merchPrivateKey);

    // Note submitting same amount for same payment token
    // within 1 minute will result in rejected payment
    // unless you turn off duplicate detection in Braintree
    var btRequest = new TransactionRequest()
    {
        Amount = 10M,
        PaymentMethodToken = paymentMethodToken,
        Options = new TransactionOptionsRequest
        {
            SubmitForSettlement = true
        }
    };

    Transaction transaction = null;

    var btResponse = gateway.Transaction.Sale(btRequest);

    if (btResponse.IsSuccess())
    {
        // SUCCESS
        transaction = btResponse.Target;
        log.Info($"Success!");
        log.Info($"Auth code: {transaction.ProcessorAuthorizationCode}");

        // Do some processing, save somewhere
    }
    else
    {
        // FAILURE
        log.Info($"Failure!");
        log.Info(btResponse.Message);
        
         // btResponse at this point has no 'Target' property
        transaction = btResponse.Transaction;
        
        // Do some processing, save somewhere
    }
}