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On the Configuration page, click Test key to open a field where you can input some text to test your translation setup - .
Type some text into the upper field and click Translate to get a translation of your text into the target language in the lower field. Note that the source (if specified) and target languages are stated for the respective fields. In this case the source language is not specified so the translation provider will detect which language is being written, and the target language is specified as English.
Figure 1 - Testing the API