BatchDecryptValue

Decrypts a set of secret values in a single request using the stack's encryption key. The request body contains an array of base64-encoded ciphertexts. The response maps each ciphertext to its decrypted plaintext value. This is a more efficient alternative to calling the single-value decrypt endpoint multiple times. Returns 400 if the request body is invalid or if message authentication fails. Returns 413 if the request body exceeds the maximum allowed content size.