To install infusion soft module first we have to register in infusionsoft and get encrypted key that we will need for authentication.

• Enable the Infusionsoft API and generate an API Key, check the instructions in Infusionsoft Articles
• Write down the encrypted key - it will be essential to getting the API to work
• Move the infusion soft modules in to your module folder and enable the module.
• On your Drupal site fill out the information on admin/settings/infusionsoft.

Check the below image for your reference.