Identify what the payment buys
Standard user subscriptions, licences granting reproduction or modification rights, advertising, technical support and bespoke development are assessed differently. Keep the platform's terms of use in the file.
If the invoice description is too general, support it with a note on the product plan, permitted use and contract clauses. Verify the identity of the supplier company in the payment country.
Test VAT and withholding separately
Services purchased abroad and used in Turkey may trigger reverse-charge VAT. The presence or absence of VAT does not by itself determine withholding treatment.
To distinguish royalties from professional or business income, examine domestic rules together with the relevant treaty article. Obtain a residence certificate before payment if it is required.