All Canon accessories are listed in the User Guide. You can find the part numbers cited above on the product page in the Canon USA online store. Scroll down the Specifications and expand the “Power Sorce” section.
https://www.usa.canon.com/shop/p/eos-r100-rf-s18-45mm-f4-5-6-3-is-stm-lens-kit?color=Black&type=New
I do not recommend using a cheap, imported power adapter. They do not work.
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