Please follow the answers in the below points -
1) Multicurrency Module is an inbuilt feature that allows collecting payments in international currencies in Pabbly Subscription Billing. A user is simply required to go to the option under the settings tab & click on an add currency option. It'll then ask to select the currency type so that a sub-account will be created in the Pabbly account similar to the main one. Further, you can switch between the currency accounts in order to add the products & plans to set up the things ready for payment collection from the customers. To know more, please follow the below links -
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Documentation -
https://www.pabbly.com/subscriptions/docs/multi-currency/
Video Tutorial -
2) Custom domain once activated will work for the Checkout page link, Client portal & Affiliate Sign-up link in the Pabbly account. For activation procedure, please check this doc -
https://www.pabbly.com/subscriptions/docs/custom-domain/
3) For handling GST, an inbuilt Tax module feature can be used in the software wherein it allows to add & create Tax rule as per the government guidelines for a specific country/region, etc. For instance, please follow the below links -
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Documentation -
https://www.pabbly.com/subscriptions/docs/tax-module/
Video Tutorial -
4) Pabbly Subscription Billing offers an inbuilt Affiliate Module that can be used to run a referral program wherein the users can register for the program using the affiliate sign-up link & could promote the services against some commission. So, promoting the services online is Affiliate marketing wherein an affiliate is eligible to earn a commission on every single purchase. The software provides different options to set up the referral program where you can set different commission rules for a specific affiliate along with setting up the payout duration & affiliate link etc. To know more, please check the below content links -
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Documentation -
https://www.pabbly.com/subscriptions/docs/affiliate-management-system/#section1
Video Tutorial -
Also, to locate the above options in PSB, please follow this post -
https://forum.pabbly.com/threads/psb-updates-shifted-existing-menus-to-a-new-position.265/
