What is the difference between an API source channel and a link source channel?

Both give a referral partner their own tracked channel so deals from them are attributed automatically, and they differ only in how the partner sends you business. A link channel gives the partner a unique link they fill out or pass along manually, which suits most accountants, realtors, and referral partners. An API channel is for a partner who wants to push client data to you programmatically from their own system or website form. Set up one channel per partner and you can see exactly which deals each one sourced, from creation through to commission, without tracking it in a spreadsheet on your side.