Multi-device data exchange account provisioning

A user device, comprising:

• one or more processors;
• and
• one or more memories storing computer-executable instructions that, when executed by the one or more processors, cause the user device to execute one or more applications configured to at least:
• transmit, to a third-party service provider, a request for account provisioning data for a user account with the third-party service provider;
• responsive to the request, receive encrypted account provisioning data and an ephemeral public encryption key from the third-party service provider, the ephemeral public encryption key corresponding to the third-party service provider;
• transmit device registration data to a server device, the device registration data comprising the encrypted account provisioning data, the ephemeral public encryption key, and a device public encryption key, the server device configured to (i) decrypt the encrypted account provisioning data using the ephemeral public encryption key and (ii) register the user device with the third-party service provider using the device registration data;
• receive, from the server device, an encrypted data exchange account identifier, the encrypted data exchange account identifier encrypted using the device public encryption key;
• and
• decrypt, using a device private encryption key, the encrypted data exchange account identifier.

One or more computer-readable media storing computer-executable instructions that, when executed by one or more processors of a user device, cause the one or more processors to execute one or more applications configured to at least:

• transmit, to a third-party service provider, a request for account provisioning data for a user account with the third-party service provider;
• responsive to the request, receive encrypted account provisioning data and an ephemeral public encryption key from the third-party service provider, the ephemeral public encryption key corresponding to the third-party service provider;
• transmit device registration data to a server device, the device registration data comprising the encrypted account provisioning data, the ephemeral public encryption key, and a device public encryption key, the server device configured to (i) decrypt the encrypted account provisioning data using the ephemeral public encryption key and (ii) register the user device with the third-party service provider using the device registration data;
• receive, from the server device, an encrypted data exchange account identifier, the encrypted data exchange account identifier encrypted using the device public encryption key;
• and
• decrypt, using a device private encryption key, the encrypted data exchange account identifier.