Changes to List pending MSA documents for the caller's group (business)

added the optional property error/authorization to the response with the default status

api tag customer-session added

added the required property data/items/version to the response with the 200 status

added the optional property error/api_client_id to the response with the default status

the data/items/document_id response's property pattern was changed from ^doc_[0-9a-hjkmnp-tv-z]{26}$ to ^doc_[0-7][0-9a-hjkmnp-tv-z]{25}$ for the status 200

the data/items/group_id response's property pattern was changed from ^grp_[0-9a-hjkmnp-tv-z]{26}$ to ^grp_[0-7][0-9a-hjkmnp-tv-z]{25}$ for the status 200