A method for securing ordered resource access of an initial resource and an additional resource, the method comprising: receiving, at a content server over a network, an initial request for the initial resource from a user-agent application executed by a client device; identifying, by the content server, access parameters of the initial request for the initial resource, the access parameters describing one or more characteristics of the initial request or the client device that are also identifiable for a future request from the client device for the additional resource at a resource server; identifying, by the content server, an expiration time for authorized access by the client device to the additional resource; generating, by the content server, a token for the initial request, the token derived from an application of a hash function to the access parameters, the expiration time and a secret key shared between an authentication module of the content server and the resource server; generating, by the content server, an authorization that includes the token and the expiration time; transmitting, by the content server over the network, the initial resource to the client device over the network; and providing, by the content server, the authorization to the client device for inclusion by the client device in the future request for the additional resource, wherein the future request is authorized by the resource server using the authorization and the access parameters in the future request to enforce ordered access of the additional resource; wherein: generating the authorization further comprises: receiving, by the content server over the network, a risk token including a risk score for the client device, the risk score describing a response of the user-agent application to a set of security tests; determining, by the content server, that the risk token has a sufficient risk score relative to a threshold to authorize the client device to access the initial content item resource; and responsive to the risk token having a sufficient risk score, generating the authorization that includes the token and the expiration time, the authorization also including the risk score for the client device. receiving, at a content server over a network, an initial request for the initial resource from a user-agent application executed by a client device; identifying, by the content server, access parameters of the initial request for the initial resource, the access parameters describing one or more characteristics of the initial request or the client device that are also identifiable for a future request from the client device for the additional resource at a resource server; identifying, by the content server, an expiration time for authorized access by the client device to the additional resource; generating, by the content server, a token for the initial request, the token derived from an application of a hash function to the access parameters, the expiration time and a secret key shared between an authentication module of the content server and the resource server; generating, by the content server, an authorization that includes the token and the expiration time; transmitting, by the content server over the network, the initial resource to the client device over the network; and providing, by the content server, the authorization to the client device for inclusion by the client device in the future request for the additional resource, wherein the future request is authorized by the resource server using the authorization and the access parameters in the future request to enforce ordered access of the additional resource; wherein: generating the authorization further comprises: receiving, by the content server over the network, a risk token including a risk score for the client device, the risk score describing a response of the user-agent application to a set of security tests; determining, by the content server, that the risk token has a sufficient risk score relative to a threshold to authorize the client device to access the initial content item resource; and responsive to the risk token having a sufficient risk score, generating the authorization that includes the token and the expiration time, the authorization also including the risk score for the client device. receiving, by the content server over the network, a risk token including a risk score for the client device, the risk score describing a response of the user-agent application to a set of security tests; determining, by the content server, that the risk token has a sufficient risk score relative to a threshold to authorize the client device to access the initial content item resource; and responsive to the risk token having a sufficient risk score, generating the authorization that includes the token and the expiration time, the authorization also including the risk score for the client device.