[An Affiliate Link is a specially coded link that recognizes the referrer and credits them with a percentage of the transaction of the sale] This post covers the mechanics of adding an affiliate link to a TG channel post. Check the info on affiliate programs for more.

Step 1: Choose the Product or Service you want to promote 
Identify the Product or Service that you want to promote via an affiliate link. For conversion and to not appear spammy, ideally it should be something directly relevant to your TG audience. Context and frequency are issues here.

Step 2: Generate an Affiliate Link
Generally speaking there are 2 types of locations that you can generate affiliate links. In house run affiliate programs and ones run through an Affiliate Merchant (basically lots of affiliate programs in the one place) To generate an affiliate link you will have to apply and get approved, follow the process for generating their affiliate linking codes. [Note-most affiliate programs will allow you to generate specific target links, visual banners etc]

Create a Post on TG 
Once you have identified and created your affiliate link then you need to add it to a new TG post for your subscribers. Stick your normal style, try to use content that tells the TG channel audience why this is relevant and important. Always check that the affiliate link works before you hit publish.
 
Step 3: Pin the Post with Your Affiliate Link 
Particularly if this is an important affiliate program to promote, e.g. the affiliate link to your other stream platforms. This will allow all TG Channel subscribers (new & old) easy visual access to what you are trying to promote.
 
Step 4: Mention the Link on Stream 
Talking about your TG Channel and what you have recently posted is great for sale conversion. It also helps you grow the subscribers to channel. There is more on how to promote affiliate links here.

For better conversion: Keep It Natural, Don’t spam, Build trust