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Home/ Questions/Q 6178219
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T00:25:13+00:00 2026-05-24T00:25:13+00:00

I am trying to get PayPal Gateway to work on a rails 3 app.

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I am trying to get PayPal Gateway to work on a rails 3 app.
But I keep hitting this error “uninitialized constant ActiveMerchant::Billing::PayPalGateway (NameError)”

I’ve this in my development.rb:


ActiveMerchant::Billing::Base.mode = :test
::GATEWAY = ActiveMerchant::Billing::PayPalGateway.new(
:login => "API USERNAME ",
:password => "API PASSWORD",
:signature => "API SIGNATURE"
)

Please help!

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-24T00:25:14+00:00Added an answer on May 24, 2026 at 12:25 am

    Your capitalisation is wrong. Try:

    ActiveMerchant::Billing::PaypalGateway
    
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