MarketplaceService.ProcessReceipt not firing in studio testing

Help and Feedback Scripting Support
#1

I have setup the ProcessReceipt callback like this. (using Knit framework, thats why you see a : in there)

function GamePassService:ProcessReceipt(receiptInfo)
    print("cheetoes are the best!")
    print(receiptInfo)
end 

MarketplaceService.ProcessReceipt = GamePassService:ProcessReceipt()

When I test in Studio, at server startup the callback fires immediately. It does both prints fine, but the receiptInfo prints nil.

However when I test purchases (in Studio) I get all the popups and confirmations from Roblox, but the callback never fires.

How do you test dev products in studio if the callback will not fire?

#2

That instantly calls the function, you probably meant to do MarketplaceService.ProcessReceipt = GamePassService.ProcessReceipt, although you would be missing the self argument.

So you will need something like

MarketplaceService.ProcessReceipt = function(receiptInfo: { [string]: any })
    return GamePassService:ProcessReceipt(receiptInfo)
end
2 Likes
#3

can you explain the part with (receiptInfo: { [string]: any })

MarketplaceService.ProcessReceipt = function(receiptInfo: { [string]: any })
    return GamePassService:ProcessReceipt(receiptInfo)
end
#5

I’m just using type annotations – since the receipt info is just a dictionary with string keys with arbitrary values of different types. I am just being explicit about it

1 Like
#6

so the code i just put in my script looks like this then

MarketplaceService.ProcessReceipt = function()
    return GamePassService:ProcessReceipt(receiptInfo)
end

would that be right?

if my method, GamePassService:ProcessReceipt returns the proper enums at the end of the function, will this work properly?

#7

You need it as a parameter in the closure

MarketplaceService.ProcessReceipt = function(receiptInfo)
    return GamePassService:ProcessReceipt(receiptInfo)
end

otherwise where did it come from

1 Like
#8

good point, when i read through the roblox code on the wiki they didn’t even have aguements:

MarketplaceService.ProcessReceipt = processReceipt

Guess it just confused me on how to make this work in Knit framewokr because except for this case, none of my code is structured in that way

#9

That is setting ProcessReceipt to the function itself, when you do a = b() you aren’t setting a to the function b itself you are setting it to what it returns.

local function b() return 1 end
local a = b()
print(a) -- 1
local c = b
print(c) -- function: XXX
1 Like
#10

learn something every day! thanks so much!!!