OneText has a native integration with MailChimp Forms (formerly Amped.io). Simply follow the 4 steps below!

1. Copy the code below:

   /////////////////////////////////////////////
   // 📲 Send new phone numbers to OneText SDK client side with email and phone
   /////////////////////////////////////////////
   if (typeof window.onetext !== 'undefined' &&// Ensure 'onetext' is defined
       input.phone_number &&
       input.email) {
       try {
   
           onetext.optin.submit({
               email: input.email,
               phone: input.phone_number,
           })
   
       } catch (error) {
           // Handle any errors that occur during the function call
           console.error('Error starting OneText flow:', error);
       }
   } else {
       // Log a different warning based on the specific condition that is not met
       if (typeof window.onetext === 'undefined' || !window.onetext.flow || !window.onetext.flow.core || !window.onetext.flow.core.start) {
           console.warn('OneText is not available on this page.');
       } else if (!input.phone_number) {
           console.warn('Phone number is not provided.');
       } else if (!input.email) {
           console.warn('Email is not provided.');
       }
   }
   
   resolve();

2. Navigate to the SMS Capture Step on your campaign > Primary CTA > Button Actions

3. Add Custom Code button action

4. Paste code in, title it & save!