error code: INVALID_REQUEST error message: The request could not be understood by the server due to malformed syntax. Magento Error

This error is caused due to the signature method error or auth expired from the auth method provided,

Recently we have noticed that the hmac_sha1 signature method has expired for some of the projects.

it can be resolved by modifying the signature method to hmac_sha256

replace the ouath_signature_method to hmac_sha256.

the error will be reolved