Answered
15 Nov 2018
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Hi David,
For this requirement you can refer to the following TPC Lookup API dcoumentation, You can use the get_value() and set_value() methods.
https://www.crmportalconnector.com/developer-network/documentation/portal-connector-widgets/tpc-client-side-api/mvc-based/lookup
And, for security reasons we do not provide access to the CRM restful API, thus the best approach would be through custom logic using TPC lookup API.
Thanks,
Sonam Joshi