Nobody hands spending power to software on the strength of good intentions. Every transaction resolves to an identified agent, acting for a known buyer, inside authority you can narrow or withdraw.
You would not hand a new hire an uncapped company card.
Nobody is asking you to hand one to software.
A mandate is a signed, revocable permission to spend. Revoke the one below and watch the agent's next calls fail. Revocation propagates in under a second, mid-transaction, without needing the agent's cooperation.