POST – required - Must be unique, PUT – identifier – cannot be changed. Allowed characters: alphanumeric (a-z, A-Z, 0-9), space ' ', ampersand '&' , hyphen '-' , underscore '_' , slash '/' ,backslash, colon ':' , parenthesis '(' and ')', curly brackets '{' and '}', pound '#', apostrophe, comma ',', asterisk '*'. Use URL encoding when special signs are sent. Percentage sign is not allowed anywhere due to Azure bug.
Example: contracts_folder
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