16. A computer-implemented method to retrieve biometric signatures to electronically sign digital documents, the method comprising: receiving, by a server device and from a first remote computing device, a request to retrieve a biometric signature from a second remote computing device for association with a signature field of a digital document stored on the first remote computing device; generating, by the server device, a Uniform Resource Identifier (URI) that, when accessed by the second remote computing device, causes presentation of an interface that receives the biometric signature for association with the signature field, the URI being generated for communication to the second remote computing device; sending, by the server device and to the first remote computing device, the biometric signature received from the second remote computing device via the presented interface.
16. A computer-implemented method to retrieve biometric signatures to electronically sign digital documents, the method comprising: receiving, by a server device and from a first remote computing device, a request to retrieve a biometric signature from a second remote computing device for association with a signature field of a digital document stored on the first remote computing device; generating, by the server device, a Uniform Resource Identifier (URI) that, when accessed by the second remote computing device, causes presentation of an interface that receives the biometric signature for association with the signature field, the URI being generated for communication to the second remote computing device; sending, by the server device and to the first remote computing device, the biometric signature received from the second remote computing device via the presented interface. 20. The computer-implemented method of claim 16 , wherein the digital document is never communicated to the second remote computing device.