1. First of all, you need to create a new user inside isplicense.com billing. His credentials will be used in further integration.
You need to authorize within my.isplicense.com billing and open "Tools" > "Add new user" section. Fill all necessary data within the form, don't forget to check "Full access permissions".
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2. Now you have to open billing system, that will be used for selling licenses. You have to create new processing module within "Integration" > "Processing modules" section, by clicking "Add" button.
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3. What we need are: Other software, SSL certificate, ISPsystem modules, ISPsystem licenses. Below you can find example of adding "ISPsystem licenses" module.
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4. Here we have to enter ISPlicense user credentials, that we've got at 1 step.
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5. Then we need to configure our tariff plans in "Products" > "Tariff plans" section. We will use "Import" functionality.
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6. Ensure that you have correct processing module selected.
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7. Select correct product type and correct tariff plan.
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8. Tariff successfully imported and configured. You can enable it.
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9. You have to repeat the process for all other products. For some products you will have to enter internal name of service type. You can do this within "Products" > "Product Types" section. Select the required type > "Edit" and find a value inside "Internal name" field:
Cpanel - cpanellic
SSL certificates - certificate
Plesk / Virtuozzo - parallelslic
CloudLinux licenses - cloudlinuxlic
DirectAdmin licenses - dalic
Proxmox licenses - proxmox
Don't forget to set correct product prices before reselling licenses to your customers!