Google calendar integration with iOS app - subscription, billing charges - calendar

I want to integrate Google calendar with my existing iOS app on App store. I will be using the Google iOS SDK and calendar APIs. I know I need to be a google developer and use developer console. My questions are,
What do I need to know regarding licensing etc?
What are the charges applicable in terms of subscription, API usage? Are these charges on yearly basis?
Where can I find info related to these?

If you want to know the licensing, billing and others, then this Cloud Platform Console Help can help you with it. You will learn here all you need to do about Billing and Payments.

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Has anyone integrated Salesforce Commerce Cloud (SFCC) with any messaging technologies?

I'm looking for examples of how others might have solved for this.
Did you build a custom cartridge?
Did you leverage some externally running agent to retrieve data by OCAPI (or Commerce Cloud APIs)? ...(i.e., a "pull" strategy)
I've read the documentation, spent many nights searching Google, searched the Salesforce Commerce Cloud Marketplace, spoken with several Salesforce Commerce Cloud expert consultants & system integration firms - but it appears no one is aware of anyone else doing this before.
Yes I was able to create a custom cartridge for Twilio.
Twilio provides many separate REST APIs for sending text messages, making phone calls, looking up phone numbers, managing your accounts, and a whole lot more.
You can go through their REST API documentation https://www.twilio.com/docs/sms/api. You can use their REST APIs and implement it in Salesforce B2C Commerce.
Follow creating a simple web service in Salesforce B2C Commerce.
https://documentation.b2c.commercecloud.salesforce.com/DOC1/topic/com.demandware.dochelp/content/b2c_commerce/topics/web_services/b2c_coding_your_web_service.html

Unable to upload contacts or create marketing campaigns with Google Cloud Platform and Sendgrid

I subscribed to Sendgrid (Essentials 40K Plan) through Google App Engine.
We can't upload contacts neither using the API or Sendgrid website. Sendgrid support says that the reason is because it's a reseller account (because I subscribed using Google Cloud Platform)
Is it true? The cost of the plans through Google Cloud Platform are the same as Sendgrid website. Should I have to unsubscribe from GCP and create a different account directly in Sendgrid? Or is it a bug from GCP or Sendgrid?
I'm planning to subscribe to a higher plan because we have thousands of users, but if we can't upload contacts or create marketing campaigns it is useless.
If they said you can't use the GCP package for Marketing Campaigns, I guess you can't. But you can create a direct SendGrid account, and use code-level integration to connect.
Either way, you should ask GCP support about this limitation as well, and let them know you'd like that feature. If it's an intentional limitation, your "tally" to add it is important for their product team.
If you use cloud launcher to integrate sendgrid, it's linked to your google cloud billing account, not your user or IAM group.
You cannot log in directly as a user, and if your switch billing accounts (or it expires, is closed etc) you can no longer access it (including contacts or templates)
Your best bet is to sign up separately - although if doing so it is pretty comparable in cost to other providers.

Technology for realtime messaging to mobile apps

We are developing a mobile game with app-engine as our backend.
We now want to add realtime messaging from our server to our clients. (IOS & android)
Note: We are not talking about push notifications.
Has anyone out there implemented realtime mobile apps and has any recommendations for us.
The Channel API is said not to be for mobile apps.
Google Cloud pub/sub is also said not to be for mobile apps.
Google Cloud Messaging may be an option but I got the feeling it's not right either.
We have looked at solutions like pubnub.com (which looks great) but it may be a bit too pricy since we hope for a huge success :-)
So our wish list is:
Deliver messages from app engine to mobile devices in realtime.
As cheap as possible since we hope for +50K daily users
IOS & Android API's or even better a Unity API.
Thanks in advance!
/Gunnar Eketrapp

When i bind a domain with GAE I need to use Google Apps. Do it mean i will be charged after trial?

when I sign in Google Apps, it says 'Google Apps for Business will expire in 31 days'
EDIT:
As of 12/6/12 Google no longer offers the "free" edition.
Changes to Google Apps for businesses
You can, however, still create a new Apps account by going through the App Engine Admin Console
If you create a new Apps account going through the App Engine Admin Console you'll still be able to create a Standard Apps account for free but you'll only be able to get 1 user per account rather than the 10 you get today.
Google App Engine Group Discussion
Original Response:
There is a Google Apps free edition -- it's called "Standard Edition". Everyday they make it harder and harder to find, though.
Here's the help article that discuses changing from Business to Standard:
http://support.google.com/a/bin/answer.py?hl=en&answer=60229
Steps to downgrade
You can downgrade to Google Apps during the 30-day Google Apps for Business free trial by cancelling the trial. If you'd like to downgrade your Google Apps for Business subscription after the end of the free trial, the timing and financial aspects depend on your billing plan.
No it is not like that what you are thinking, you can even signup for Google Apps for Free. It is a free version. You can signup into it with the following link.
http://www.google.com/intl/en_in/enterprise/apps/business/pricing.html
Even if you have already signed up for Google Apps for business you can degrade it to free version by navigating into your admin panel and follow the steps in the URL.
http://support.google.com/a/bin/answer.py?hl=en&answer=60755

web shop (shopping cart) on google app engine

there are currently no off-the-shelf shopping carts for use on Google App Engine
is the only solution on GAE at the moment to bespoke your own?
what has other people done in terms of a shopping facility on GAE?
PayPal is offering a new open source toolkit for Google App Engine that lets you integrate Java apps running on App Engine with the new PayPal Adaptive Payments API. The Adaptive Payments API lets developers embed payments into their apps, services, and platforms.
Here is a link to the google appengine blog: paypal-introduces-paypal-x-platform
There will be a Python version of the toolkit coming out soon, PayPal says.

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