A point to note would be that the developer of the client application should create programming code elements along with interface implementations, instances or objects. Authentication to access Zoho CRM APIs is through OAuth2.0 authentication mechanism. Invariably, HTTP requests and responses are taken care of by the SDK.
A sample of how an SDK acts a middle ware or interface between Zoho CRM and a client JS application.
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The access and refresh tokens are environment-specific and domain-specific. When you handle various environments and domains such as Production, Sandbox, or Developer and IN, CN, US, EU, or AU, respectively, you must use the access token and refresh token generated only in those respective environments and domains. The SDK throws an error, otherwise.
For example, if you generate the tokens for your Sandbox environment in the CN domain, you must use only those tokens for that domain and environment. You cannot use the tokens generated for a different environment or a domain.
For Contact Roles and Records API, you will need to provide the ZohoCRM.settings.fields.ALL scope along with the ZohoCRM.modules.ALL scope while generating the OAuthtoken. Otherwise, the system returns the OAUTH-SCOPE-MISMATCH error
For Related Records API, the scopes required for generating OAuthtoken are ZohoCRM.modules.ALL, ZohoCRM.settings.fields.ALL and ZohoCRM.settings.related_lists.ALL. Otherwise, the system returns the OAUTH-SCOPE-MISMATCH error