Abstract: To ensure that clients use the most current versions of schemas and provide requests to particular Application Programming Interfaces (APIs) in a desired order, identifiers associated with resources may be used to determine client requests that comply with desired schemas and API interactions. When a request to access a first resource is received, a link to a second resource and an identifier may be provided. When a request to access the second resource is received, if the identifier associated with the request is absent or does not match the expected identifier, the request may be denied without using computational resources to process the request. Identifiers may include strings included in Uniform Resource Identifiers (URIs) or query parameters. Identifiers may also include modified field names, arrangements, or other characteristics of schemas associated with the requests. Schemas of received requests may be converted to standard schemas to prepare a response.