Cotter provides one-tap passwordless login for websites and applications. The Cotter User API enables developers to add users to the service, and retrieve user (or list of users) identifier, such as phone number or email address. The service authenticates users based on ownership of a device, and allows instant login using a magic link or a verification code sent via email, SMS, or WhatsApp.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.