Typing affiliate link each time you find suitable keyword will be daunting task and another problem will appear when the company decide to change affiliate link structure. Find the link one by one will be a nightmare 
I just found a wordpress link called Kaitora Affiliate System and I’ll give it a try.
Installation Process
Installation process will be suitable for web hosting that support seamless upgrade and install process aka sudo php. If not, you must upload the file manually using ftp client like filezilla or coreftp.
Click Add New link on WordPress admin
Type “kaitora affiliate system” and hit search plugins button.
