Hi Walter, As you are already aware, budget is immutable in the trial campaign. However, you can either archive this campaign and create a new draft with the budget that you want or, you can graduate it to function as a totally full campaign upon which the budget field will be editable. Please refer this section <https://developers.google.com/adwords/api/docs/guides/campaign-drafts-experiments#promotion_graduation_and_archiving> of guide for better clarity and let me know if you have any further questions.
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