Is Arducam shutter triggered over I2C or SPI?

I have to squeeze a camera into an existing design. The MCU that triggers the camera does not have SPI pins available but does have I2C. A secondary MCU that is periodically engaged with the first has both I2C and SPI and needs to read and process the image.

I’m not sure how the code libraries interact with the camera, but if I can trigger with I2C and read via SPI from a second MCU I’ll be ok. Does it work like this?