Once you sign up with any of that server make sure to verify your account Email and Billing as well, Without billing verification we aren't able to create or use their machine.
We use image kit for all our image storage for products. We use this tool as it optimizes image on runtime so we can get the different sizes of images we need on an app or website from the same source image easily. It automatically optimizes all the images as well.
SignUP: https://imagekit.io/registration?code=0hxt4055 COST: FREE ( later upgrade if you cross their Free limit uses )
We use SendBlue to trigger Email or OTP through our system like once customer signup or order notifications etc.
Email Cost: FREE Upto 300 Email daily, If you want more you can upgrade account
OTP Cost: OTP cost change based on country, You can purchase OTP credit once you have an account on Sendblue, BUY OTP.
Once you purchase OTP you may need to share details like where you going to use OTP then they authorize your account to send OTP to customers.
You need to keep all information correct otherwise they will not approve your account so be careful once you create an account and in some cases, once your signup they may ask to support their contact with basic information so you can send them a manual approval
We send push notifications to customers with each product status update or you can use this to send messages to all customers from our CMS. You need to sign up and get their key to use in our system.
SIGNUP: https://onesignal.com COST: FREE ( later upgrade if you cross their Free limit uses )
FIREBASE: https://firebase.google.com/ COST: FREE
If you want we share our developer account and you can add in your firebase account as admin if you have an issue to share your main Email/password. **
We used MongoDB as a database to store the information. You can install MongoDB locally on the machine and used this our you can get any Cloud-hosted MongoDB to use as well. In Demo, We are using Cloud hosted MongoDB. You can create an account as basic uses for this cloud-hosted MongoDB FREE.
For further description and steps about creating free mongoDB. see here
We used Google location Api key to detect user locations and distance. Get Google API Key
You need to get a Google Play developer account to publish your app on the android store. Google will charge you 25 USD One time cost to upload your app. You can create an account with your existing Gmail account.
You need to have a developer account to upload any IOS app to Apple store. You need to Enroll through this link. Apple will charge you 99 USD/Yearly for a personal account and they have a different price if you want to register a company.