Hello everyone,
I would like to integrate a private mobile app to Hubspot CRM such that when a sign up is made on the app, a contact is created for that contact in Hubspot Contacts.
Is this possible?
Thank you.
Hi @DEffiong,
It’s pretty easy to create new contacts on HubSpot from your mobile app.
You simply need to make an API call to this endpoint :
https://api.hubapi.com/crm/v3/objects/contacts
More information on the contacts API
Be careful however not to include your hapikey in your mobile app code if that where you’re going to make the calls from as it can be “easily” retrieved by anyone with a malicious intent and used to mess with your HubSpot instance.
It’s probably best to build a proxy API that will call HubSpot from your server, so you don’t compromise the security of your instance by including the hapikey within the app’s code.
I’m no security expert but I’ve dabbled with mobile app API calling in the past and this is one of the many pitfalls. If you want to dig deeper, you will find plenty of information related to making an API call from a mobile app on the internet.
Hope this helps !
If it does, please consider marking this answer as a solution 
Best,
Ludwig