First, to use the OpenAI API, you must register a payment method . Please prepare a credit card that supports international payments in advance. Costs are charged on a pay-as-you-go basis, so please be sure to set up a limit to avoid excessive charges.
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Next, proceed with issuing the API key . Be sure to save the API key in a notepad at this stage. For security reasons, an API key that has been exposed once will not be exposed again. The API key has a structure like sk-...ifFb .
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When linking an openAI account in n8n, copy and paste the API KEY issued above into the API KEY field to complete the process.