Forward reason is not required - as some users when forwarding to another signer can supply no reason.

When a signer forwards and does not give a reason, when reading the document, it throws an exception. Saying that the reason is required when it is not required (epically when reading the document)

signrequest-php-client/src/Model/Signer.php

Line 1183 in 56d11ba

if (!is_null($forwarded_reason) && (mb_strlen($forwarded_reason) < 1)) {

[Spone]

Same problem in the Ruby client:

https://github.com/SignRequest/signrequest-ruby-client/blob/2bd77681571f7ef2ce86bfd555a41f6b926e527d/lib/signrequest_client/models/signer.rb#L410