GraphQL mutation error when adding new customer through Shopify API in Android app

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GraphQL Parse Error When Adding Customer via Shopify API

I’m building an Android application that integrates with Shopify. I keep getting a parse error whenever I try to add a new customer using GraphQL mutations. The error mentions something about a parse issue with curly braces but I can’t figure out what’s wrong with my syntax.

My Current Implementation

const createUserMutation = `mutation addNewCustomer($customerData: CustomerCreateInput!) {
  customerCreate(input: $customerData) {
    customer {
      acceptsMarketing
      email
      firstName
      lastName
      phone
    }
    customerUserErrors {
      field
      message
      code
    }
  }
}`;

const mutationVariables = {
  "customerData": {
    "acceptsMarketing": false,
    "email": "[email protected]",
    "firstName": "Sarah",
    "lastName": "Doe",
    "password": "myPass123",
    "phone": "+1234567890"
  }
};

async function executeGraphQLQuery(mutation, variables) {
  return fetch('https://mystore.myshopify.com/api/graphql.json', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-Shopify-Storefront-Access-Token': accessToken,
    },
    body: JSON.stringify({
      query: mutation,
      variables: variables
    }),
  })
    .then(res => res.json())
    .then(data => console.log('API Response: ', data))
    .catch(err => console.log('Request failed: ', err.message));
}

Error I’m Getting

{"errors": [{"locations": [Array], "message": "Parse error on \"{\" (LCURLY) at [16, 20]"}]}

Has anyone encountered this type of parsing error before? What could be causing the issue with the curly brace syntax?