How does one link Webhook parameters to API results?

I have successfully used the API to upload a transient document, use that document to create and agreement and have it notify the participant.

I created a webhook to update my system when the participant signs the document. Everything works fine but the AgreementID and DocumentIDs provided by the Webhook "parameters" do not match any values returned from the API when uploading the file or setting up the Agreement.

Based on current results, the IDs in the Webhook callback are basically just randomly generated and have no relation to anything.

Sample transientDocumentID (returned when pdf is uploaded through API [ POST /transientDocuments ]):

3AAABLblqZhAAnpiRlTbjyqgKc7LeA3mKVVUVdtIote4eOsHbxebHYUfxyHhl60v0Crh1kYGd4yJsuHMPmZhTdWZwet0Jqh9vsgTsFN_hzZ1fhIx6_VmMU2zZyv_VEVkC4zUG21kZ7O4aglUI3ifXiy9EohYGZ8NNtaVCfivQeKmiEW5o3RIZAORHWlhW0lzGk_YyRqdfnzh8pETVzbJsOBRZdmK7UPPv0EAFuChplMp6HwlHw9DLXk4cKAW7BA8nD33XQ76NLSa5miZ0Xp3zmqGZEXVwaqNIBRoFmMpI_CGUHKgjD_An8Xgq9o7iduAO3b-Avmlz5cglbf4YIW3izMukKxdZm1MqvOZuRLCxCOOB4qkBfXezTA**

Sample AgreementID (returned when creating an agreement [ POST /agreements]):

3AAABLblqZhDDdVRJ8RjuJLIpZoinMcZ_WRlpStLuJcfOgi6GJBwRuX2L4q0U4o9CQa0LOGqjLUFir1qDsN7ErsR2B6c6J9il

Values returned in Webhook callback:

AgreementID:

CBJCHBCAABAA8b9lEs6TH0Cxr9usQTZEWTPSn3ZSuzls

DocumentId:

3AAABLblqZhCHI8UJehxreOAJb_IkZVSAGfJAzg-nyHB_a-CeenUjyCuarNL5ed_vq4yterDkAkASi1_2S65f8DNvfvwtfh7B

With garbage data like this, there is no way to link a webhook call to a document or agreement. What gives?