The Application Programming Interface (API) of Fellowship One provides a way for churches to leverage their own church data within custom built applications. This tutorial is going to outline how you can use our API to build a custom login to your church website by authorizing the user based on their WebLink or InFellowship login credentials. This is a 2nd party application and this post builds upon the foundation laid by Jas Singh here. You will find links to the PHP oAuth library and more detail about 2nd party authorization in his post.
Step 1: Build a login form
First, you will need to build a login form requesting a username and password. If the majority of your church has already converted their WebLink login to an InFellowship login, then you will want to ask for their email address…
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