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Your application should retrieve the automatic configuration from the developer platform configuration endpoint, providing its environments credentials. Your application should then be able to use the right marketplace API configuration (e.g.: which REST API host to use) based on the context of a controller action and/or database model. Multi-marketplace configuration is achieved by associating a configuration preset to a "marketplace key" (unique identifier, as an example: 'maestrano-singapore') which will then be used to tag models and to parameterize routes.
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