message: Set the content-type properly for the POST to /api/prepaid-card-customizations
diff: import Service from '@ember/service';
  import config from '../config/environment';
  -import { all, task } from 'ember-concurrency';
  +import { all, task, TaskGenerator } from 'ember-concurrency';
  import { taskFor } from 'ember-concurrency-ts';
  import { tracked } from '@glimmer/tracking';
  import { inject as service } from '@ember/service';
  @@ -155,7 +155,7 @@ export default class CardCustomization extends Service {
  @task *createCustomizationTask(
  params: CreateCustomizationTaskParams
  - ): PrepaidCardCustomization {
  + ): TaskGenerator<PrepaidCardCustomization> {
  let response = yield fetch(
  `${config.hubURL}/api/prepaid-card-customizations`,
  {
  @@ -163,6 +163,7 @@ export default class CardCustomization extends Service {
  headers: {
  Authorization: 'Bearer: ' + this.hubAuthentication.authToken,
  Accept: 'application/vnd.api+json',
  + 'Content-Type': 'application/vnd.api+json',
  },
  body: JSON.stringify({
  data: {
  