There are two ways that I would do it depending on the width of the ledge on top of shower base. If you have enouch room I would shim studs with strips of material thick enough to bring the surface out even with flange on shower base. Then I would put cement board(wonder board) on wall and over shower flange to set on top of shower base. Finish seams on wall board per manufacturers directions,Let seam filler dry then seal with thompsons water seal or equivalent sealer. Let that dry then tile on that grouting and sealing with quality caulk at joint between shower base and tile.
If ledge on shower base is not wide enough then I would place cement board directly to studs then use filler strips on face of shower base flange to bring two surfaces flush. Water seal let dry and tile again coming down over top of shower. Grout and caulk to finish. P.S. I would use a siliconized latex emulsifier to mix in with grout. It gives a better ware proof seal. Hope this helps you. Good luck and thank you.
This post may help you to install a shower pan.
https://www.chriply.com/how-to-install-a-shower-pan/
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