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Hello, Thank you for reaching out to the API Support team here at Constant Contact. I don't know of any specific limitations using Constant Contact's API that would arise from using a WebLogic server. Though that error message would indicate that Retrofit2's class "callback" is not being found or that retrofit2 is not set as a dependency properly. I would recommend looking into how you are setting your Retrofit2 dependency and if it is being loaded correctly. It also may be that retrofit2 is not supported on a WebLogic server. Regards, David B. Tier II API Support Engineer
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