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On Interswitch's Privacy Page you can request and collect all the privacy and GDPR related information that Interswitch is providing.
The basis for Interswitch Limited sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.
Subprocessors are companies that provide a service for Interswitch Limited and who has or potentially will get access to personal data of their customers.