Functions to query or manipulate the registry of credential functions
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One or more functions with the right signature: its first argument
A list of credential functions.
A list of credential functions or
cred_funs_list: Get the list of registered credential functions.
cred_funs_add: Register one or more new credential fetching functions.
Function(s) are added to the front of the list. So:
* "First registered, last tried." * "Last registered, first tried."
cred_funs_set: Register a list of credential fetching functions.
cred_funs_clear: Clear the credential function registry.
cred_funs_set_default: Reset the registry to the gargle default.
token_fetch(), which is where the registry is actually used.
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